(2016. Stuttgart. 3. 10/21/2020 Biology College answer answered in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. moist summers and dry winters b. Progress in understanding changes in soil biology in response to latitude, elevation and disturbance gradients has generally lagged behind studies of above-ground plants and animals owing to methodological constraints and high diversity and complexity of interactions in below-ground food webs. Northeast. Warming temperatures play a role, facilitating mountain pine beetle activity at higher elevations and for longer time. Geographers recognize a number of factors that affect a region’s climate: latitude. , the mid-altitude forest (MF), ranging from 1700 m a. gov website. Under what condition will true altitude be lower than indicated altitude? 1. This resulted in 40 106 out of the 159 sites being selected. The park is named for Blue Knob, the second highest mountain in Pennsylvania at 3,146 feet (959 m). Because they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have _____ ecosystems. Proceedings from the conference on the ecology and management of high-elevation forests in the central and southern Appalachian Mountains. Though the trail is only 2. chaparralInformation about historical fire regime and forest structure is valuable for managers but the information is prob-ably less specific and stable for high-elevation forests than for low-elevation ponderosa pine forests. Their highest peak, with an elevation of 4,223 feet (1,287 m) above mean. Species niche differences shape our high-elevation forest communities. g. Get an answer. Some scientists propose that increased soil acidity might be the cause. This community occurs around heath woodlands and fens in high-elevation valleys in the White Mountains and the North Country. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Soils are wetter than in the other two high-elevation forest communities and the vegetation of the community resembles that of lowland spruce - fir forest. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. A re‐assessment of the high elevation treeline positions and their explanation. climate regions D. Ozone depletion . Scenery: The trail primarily travels through. Whereas it does not occur in the dry forests of the. Some scientists propose that increased soil acidity might be the cause. Following 2020's extreme fire season, high-elevation forests in the central Rocky Mountains now are burning more than at any point in the past 2,000 years, according to a new University of Montana. , eds. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. tropical forest D. Pennsylvania. Similar to our study, Sharma et al. Forest fires of the western United States have advanced upslope over the past few decades, scorching territories previously too wet to burn. The tallest redwood in the world is called Hyperion, standing at an incredible 380 feet. In a multiyear project, highlighted in two new publications, we tracked how often forest fires occurred in high-elevation forests in the Rocky Mountains over the past 2,500 years, how those fires varied with the climate and how they affected ecosystems. Weegy: In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The study observes changes in upslope advance in high-elevation forest fires, how climate aridity—and our warming planet—is correlated with these fires, and how biodiversity loss and vegetation conversion factor into these changing conditions. Little brown bats are not territorial—they live in colonies numbering in the hundreds of thousands of individuals. Score 1 User: The ring of fire on the map. A. economic regions The forests of the Pacific Northwest are just one of the many different economic regions in the United States where many people work in the same industry. climate regions D. Colonies aggregate at nesting sites called roosts. User: Because they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have _____ ecosystems. Current initiatives to study forests over continental or global scales still have important geographical gaps, particularly in regions such as the tropical and subtropical Andes. At the highest elevations of the Allegheny Mountains in West Virginia, generally above 1,000 m, relict patches of boreal forests remain from cooler, periglacial times (Lesser 1993). Acid caused by S*O_{3} combustion mixed with atmospheric water vapor B. Hyperion was discovered. Not least they serve as an. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Snagfall the first decade after severe bark beetle infestation of high-elevation forests in Colorado, USA CHARLES C. [Google Scholar] KullmanL. This phenomenon is: Decreased in pH caused by climate change. The Caribbean islands are recognised as one of 36 global biodiversity hotspots and their mountain forests that have avoided deforestation (unlike most of the lowlands) are a particularly important. Why is Elevation Important? In this fact sheet, the term high elevation will refer to elevations above 5,000 feet. [ The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. High-elevation forests in Colorado and southern Wyoming are experiencing bigger wildfires than at any point in the last 2,000 years, according to a new study published in the Proceedings of the National Academy of Sciences. Search for an answer or ask Weegy. Pennsylvania boreal conifer forests and their bird communities: past, present, and potential. “Snowfall in our high-elevation forests is lower now than in past decades, and summers are hotter. Most of the high altitude wetlands in South Asia, including Nepal, lie within the Hindu Kush Himalayan Region that extends over 3,500 km and covers approximately 3. View. 36 °C by 100 m) and aspect, while the aspect was relevant for RH. The area corresponds to the “Abies amabilis zone” of Franklin and Dyrness (1973), whichforests. Polylepis (Rosaceae: Sanguisorbeae) forests are distributed across the Central Andes between elevations of 3500 to 5200 m a. The. Pine Creek Gorge, located in Tioga State Forest, is known as the Grand Canyon of Pennsylvania for its dramatic views and steep glacially carved walls. This phenomenon is: Decreased in pH caused by climate change. Some scientists propose that increased soil acidity might be the cause. Decreased in pH caused by climate change C. Choose the factors that influence the climate of the U. Weegy. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Rating. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Background Previous studies have shown that plants often have species-specific effects on soil properties. Steep elevational gradients bring multiple forest types and fire regimes together in close proximity. 1990). in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. Following 2020's extreme fire season, high-elevation forests in the central Rocky Mountains now are burning more than at any point in the past 2,000 years, according to a new study. Some scientists propose that increased soil acidity might be the cause. Forest types and human impact. Such information can be used in a variety of applications and at different geographical scales, including land surface process monitoring, natural resource management, and hydrological modelling (Fang,. com is the easiest and fastest way to get answers to your questions, by providing a mashup of several technologies including an AI-enabled Q&A knowledgebase and integrated chat with live experts. The ecoregion is located in the central and southern Appalachian Mountains, including the Ridge-and-Valley Appalachians and the Blue Ridge Mountains. Martha Kent brought the cactus to Bozeman, most likely from Pennsylvania by wagon. Some scientists propose that increased soil acidity might be the cause. Vermont. In a PNAS article published last month, Alizadeh, Sadegh, Abatzoglou, and their colleagues report that forest fires have been advancing upslope across the western United States in recent decades. , the Qinghai spruce forests are also mainly distributed at the middle- and lower-slopes, accounting for 34. From late June through September, field crews hike to plots randomly located in the high-elevation white pine forested areas in Sequoia, Kings Canyon, and Yosemite national parks (Figure 1). One hypothesis for the lack of coherent responses in growth and resource use efficiency in high-altitude ecosystems is that regional CO 2 and warming effects are secondary to local hydrologic, biogeochemical, and ecological factors (17, 20–23). 2013) may be driven more by climate than fire suppression, the increased fuels at high elevation may connect previously discontinuous forest stands and allow fires to carry farther upslope. Highest point in Pennsylvania, the 'cradle of forestry' and other little-known facts from our state parks and forests. Some of the most common types are political, physical, topographic, climate, economic, and thematic maps. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. elevation regions B. C. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Some scientists propose that increased soil acidity might be the cause. 5 million sq. Total N concentration in the forest floor of red spruce forests is correlated with wet N deposition at both low and high elevations in the Northeast (McNulty et al. 100 S Main St 300 S Main St 232 Smith St 649 S Broad St 410 Thompson St Jersey Shore Porter Township 347 Oliver St 230 High St 321. Updated at : December 11, 2020 23:29. NRS-P-64. In general, fine roots showed their highest nutrient concentrations. New answers. 9 m/y. Pennsylvania, constituent state of the U. the result of high N inputs (Sprugel 1984). Because these areas are determined by natural terrain, ecology, and conservation priorities, many ecoregions do not adhere to state boundaries, and the High Allegheny Plateau. chaparral Weegy: Because they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have highland ecosystems. l. Rep. Its deepest point is 1,450 feet below the rim. S. F. In: Beniston M, Innes LJ, eds. Forests in the mountains are mostly dominated by Pacific silver fir and mountain or western hemlock. The San Francisco Peaks/Dook’o’oosłííd in northern Arizona rise to 3851 m elevation with slopes that span many of the major forest types of the southwestern US mountains. It is bounded to the north by Lake Erie and New York; to the east by New York and New Jersey; to the south by. We compare census data and social group counts from two forests in the Udzungwa Mountains, Tanzania. Mt. , 2009) which exert dominant control over forest productivity and tree water status (Körner, 2017; Maxwell et al. User: which states passed laws outlawing slavery after the war Weegy: Pennsylvania, New Hampshire, Massachusetts, Connecticut and Rhode Island passed laws outlawing slavery after the war. Most high-elevation forests haven’t been subjected to much fire suppression, logging or other human activities, and because trees at these high elevations are in wetter forests, they historically have long return intervals between fires, typically a century or more. From the preceding analysis, it is evident that the average elevation of treeline in the Western Himalaya is around 3615 m asl, but trees are recorded up to 4200 m. Some scientists propose that increased soil acidity might be the cause. Weegy: When a poet wishes to use figurative language, he or she will use words that are both connotative and denotative. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Some scientists propose that increased soil acidity might be the cause. A tiger has been caught on camera at an elevation of 3,165 metres in Ilam district of eastern Nepal in the first ever sighting of the big cat at such a high altitude. A. grassland B. Methods Archive maps, satellite and on-ground data. Pennsylvania Natural Heritage Program information for the conservation of biodiversity WILD HERITAGE NEWS Summer 2022 Most people picture massive, towering trees when they think of an old growth forest, and they usually aren’t thinking of Pennsylvania. grassland B. Within the elevation range of 2800–2900 m a. Whispering Secrets. In high elevation forests in the Southern Rocky Mountains, North America, areas that are dominated by a single tree species are often adjacent to areas dominated by another tree species. Correa‐Díaz 1, L. Wildfires are an integral process in vegetative terrestrial land which shape ecosystem functions. Connotative Weegy: Connotative definitions are. highland C. The tr 107 ees at high elevations of MTP are almost all conifers, mainly Abies 108Studies have shown that many lower-elevation forests on the West Coast of the United States were experiencing a “deficit” in fire activity compared with historical patterns, partly because of. 3. Douglas-fir is also frequently planted on cutover areas within this zone. Insects burrow and munch; trees deploy lethal and disruptive defenses in the. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Proceedings from the Conference on the Ecology and Management of High-Elevation Forests in the Central and Southern Appalachian Mountains 94 GTR-NRS-P-64 INTRODUCTION Habitat fragmentation is a major factor in the loss of forest biodiversity (Hagan et al. A. Acid caused by S*O_{3} combustion mixed with atmospheric water vapor B. Scenery: The trail primarily travels through hardwood forests and the occasional coniferous forest with numerous creeks. In high-elevation. F) plateau. grassland B. Some scientists propose that increased soil acidity might be the cause. (18°56′S and 69°00′W). located at its lower elevation margin (18°24′S and 69°30′W) and the other of P. Blank 2: wet, rain, or moist. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Southwestern US mountain ecosystems contain a variety of vegetation communities organized along an. Weegy: Weegy. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. 3 km 2) followed by kharsu oak (1461. BEST HIKES ON THE BLUE RIDGE PARKWAY IN NC. To reconstruct past fire regimes across this broad. The National Audubon Society reports that deforestation has led to over a fifty percent decline in their population levels over the past forty years. In recent decades, due to constant anthropogenic pressure and considerable changes witnessed in the climate of the region, species of this region are threatened. Using linear mixed-effects models, empirical cumulative distribution functions, and spatial analysis,. The limit set by low temperature at high elevation or high polar latitudes is termed ‘treeline’ (alpine or arctic treeline). The primary objectives of this study were to (1) measure N input, uptake, internal generation and export; (2) quantify N pools in biomass and soils in a high-elevation forest in the Adirondacks of New York; and (3) assess the relative importance of atmospheric deposition of N compounds in N cycling. Yet they experienced the highest rate of increase in fire activity in the. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The limit set by low temperature at high elevation or high polar latitudes is termed ‘treeline’ (alpine or arctic treeline). As climate warms, bark beetles march on high-elevation forests. This phenomenon is: Decreased in pH caused by climate change. Below the grove, a Juniperus tibetica forest covers the slope with trees 4 to 6 m in height. Non-native disease-carrying mosquitoes have decimated low elevation populations of native Hawaiian birds, and are now moving into high elevation forests, such as the one shown here. The Cumberland Mountains are a mountain range in the southeastern section of the Appalachian Mountains. Together, these factors control the range of temperatures and the amount of rain and/or snow each region receives. Clicker. Proceedings from the conference on the ecology and management of high-elevation forests in the central and southern Appalachian Mountains. The high-elevation open-canopy northern red oak stands under investiga-High-elevation forests are experiencing high rates of warming, in combination with CO2 rise and (sometimes) drying trends. Strong interannual links between aridity and high. In high-elevation forests in. 3. Rep. User: Because they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have _____ ecosystems. high-elevation tree species, treeline is an abrupt bound-ary in this area. Ask a question. Mountaintop removal site Mountaintop removal site in Pike County, Kentucky. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. , xylogenesis). Some scientists propose that increased soil acidity might be the cause. Some scientists propose that increased soil acidity might be the cause. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. These high-elevation forests share several charac-teristics, including high snowpack retention, low species diversity, low evapotrans-piration and climatic water deficit, longer and more variable fire return intervals, and high sensitivity to changes in climate. High-mountain ecosystems like the upper forest line (or timberline), the tree line ecotone, and the subalpine meadows and scrublands are particularly sensitive to changes in both climate and land use (Ameztegui et al. Decreased in pH caused by climate change C. 50 °C ± 0. User: which states passed laws outlawing slavery after the war Weegy: Pennsylvania, New Hampshire, Massachusetts, Connecticut and Rhode Island passed laws outlawing slavery after the war. Some scientists propose that increased soil acidity might be the cause. Situated at 7,000. climate regions D. 8 miElevation gain 118 ftRoute type Loop. ] Score . In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. While mountain pine beetle is a native species and has historically had periodic outbreaks, the recent epidemics in high-elevation western forests are considered unprecedented in duration and magnitude over the past 200 years. “The fact that Aspen is regenerating prolifically after wildfire is not a surprise,” said Robert Andrus, who conducted this research while working on his PhD in physical geography. Acid rain is caused by the combination of sulfur dioxide (SO₂) from combustion and. C- Glaciers cause erosion through the movement of large chunks of ice, which are deposited and form depressions. What's this phenomenon? O A. Environmental Science. This phenomenon is: Decreased in pH caused by climate change. Proceedings from the conference on the ecology and management of high-elevation forests in the central and southern Appalachian Mountains. In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Large, severe fires in the West followed by increasing drought conditions as the planet warms are leading to lower tree densities and increased patchiness in high-elevation forests, according to a new study. Furthermore, warming has changed characteristics of wildfires enabling a median upslope advance of 252 m in high. Geologists, it turns out, don't readily agree what height makes a mountain a mountain, but an elevation of 300 meters (1,000 feet) is generally high enough to earn the classification. economic regions The forests of the Pacific Northwest are just one of the many different economic regions in the United States where many people work in the same industry. If climate warming continues in northeastern China, further continuous and substantial increase in tree growth would substantially raise forest productivity in mixed coniferous and broad-leaved forests. Moore,1,†* Nicole A. New methods have opened research. Some scientists propose that increased soil acidity might be the cause. Search for an answer or ask Weegy. High-elevation forests only burn about once every 100 to 250 or more years on average. Some scientists propose that increased soil acidity might be the cause. 8 miElevation gain 118 ftRoute type Loop. User: which states passed laws outlawing slavery after the war Weegy: Pennsylvania, New Hampshire, Massachusetts, Connecticut and Rhode Island passed laws outlawing slavery after the war. Tech. New answers. Treelines around the world vary in elevation but are all characterized by having a similar mean July temperature of about 13 deg C (55. This phenomenon is: Decreased in pH caused by climate change. Throughout the 1800s, timber barons cut down nearly all of Pennsylvania’s forests. This phenomenon is: Decreased in pH caused by climate change. , 2005; D’Arrigo et al. This long view. All three forest communities were more efficient in nutrient-use than several broad leaf forest communities at 300 to 2200 m altitude in the central Himalaya (42-79 g. Some scientists propose that increased soil acidity might be the cause. Some scientists propose that increased soil acidity might be the cause. Some scientists propose that increased soil acidity might be the cause. 7 km 2) and birch (340. Here, we analyse tree-ring-based growth-climate relationships for two dominant tree species along an 800-m elevational. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Decreases in pH caused by climate change O C. Montane forests occur between the submontane zone and the subalpine zone. Latitude, temperature, moisture and elevation define the distribution of various temperate forests and trees. 2009 May 14-15; Slatyfork, WV. Here, we assessed soil properties beneath adjacent stands of trembling aspen, lodgepole pine, and Engelmann spruce, which are dominant tree. User: in high elevation forests in pennsylvania ecologists have noticed a serious decline in certain tree species some scientists (More)In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The Cameron Peak Fire in Colorado in 2020 was the state’s largest fire in its history, burning over 208,000 acres (84,200 hectares) and is a prime example of a high-elevation forest fire. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. tropical forest D. BERLIN—Forests at high-altitudes in the Himalayas and Tibetan Plateau are at risk of dying off or retreating downslope as a result of climate change, threatening. Mercury contamination B. (Kessler and Schmidt-Lebuhn, 2006). 1999). It covers an area of about 61,500 square miles (159,000 km 2) in:. Tree growth in high-elevation forests may increase as a result of increasing temperatures and CO2 concentrations in the atmosphere (Ca). This phenomenon is: Decreased in pH caused by climate change. Weegy. Location: North Central Pennsylvania in Tiadaghton State Forest near the settlement of Slate Run. High elevation and the rain-shadow effect from theThe record-setting 2020 fire season, with three of Colorado’s largest fires, helped push the rate of burning in high-elevation forests in Colorado and Wyoming into uncharted territory relative. Herbaceous plants above treeline are scarce, occurring in densities considerably less than 1 plant/M2. , 2008), climate warming having been found to reduce sensitivity of recent tree-growth to temperature at high northern latitudes and affect tree survival (Briffa et al. The Wieslander survey from the 1930s provides an anachronistically high resolution (minimum mapping unit of 16 ha) and expansive (176,900 km 2). This community occurs around heath woodlands and fens in high-elevation valleys in the White Mountains and the North Country. Temperatures decrease 5 degrees (F) for every 1,000 foot increase in elevation. The vertical differentiation of climatic conditions and the strong altitudinal gradients result in a characteristic vegetational zonation (Ozenda and Borel, 1990) with. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. C) forest. 3. A. 9787 10/21/2020 Biology College answer answered in high elevation forests n Pennsylvania, ecologists have noticed a serious decline in certain tree species. Search for more papers by this author. This chapter provides an overview of studies conducted at treelines of the Nepal Himalaya. Red spruce dominates at low elevations [ 327 ]. Most Pennsylvania forests are now in age classes between 60 and 120 years, with the largest 10- In high elevation forest in Pennsylvania ecologists have noticed a serious decline in certain tree species. High-elevation forests including treeline ecotones are particularly valuable as wildlife habitats and because of their protective function such as avalanche and erosion control (e. political regions C. economic regionsBecause they are located above 15,000 feet, areas in the Tierra Nevada elevation zone have _____ ecosystems. political regions C. Black Forest Trail Quick Facts. What's this phenomenon ? A. In recent decades, increasing temperatures and prolonged drought have been linked to. Since acquiring this property, The Nature Conservancy has developed a forestry management plan to improve the ecological conditions of the land to help. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Some scientists propose that increased soil acidity might be the cause. Why are business owners most likely viewing a topography map before construction?, Winston studies a topography map that shows camping and hiking areas. 6 m/y, a rate comparable to the elevational velocity of vapor pressure deficit of 8. This is a summary of the most current data available describing Pennsylvania’s forest resources. Hough, A. E) North America. highland C. This phenomenon is: Decreased in pH caused by climate change. This phenomenon is: Decreased in pH caused by climate change. Following 2020's extreme fire season, high-elevation forests in the central Rocky Mountains now are burning more than at any point in the past 2,000 years, according to a new. The Appalachian–Blue Ridge forests are an ecoregion in the Temperate broadleaf and mixed forests Biome, in the Eastern United States. The upper limit of montane forests, the tree line, is often marked by a change to es that. S. soils with high mineral content d. Some scientists propose that increased soil acidity might. The study area is characterized with rugged topography, extreme climatic regime, and a. One of the earliest written accounts was possibly Conrad Gessner’s description of the forest limit in the front ranges of the Swiss Alps in 1555, and high elevation forest limits played a prominent role in Alexander von Humboldt’s global. Final answer: The serious decline in certain tree species in high-elevation forests in Pennsylvania is caused by acid rain. These high elevation forests have been changed by the recent mountain pine beetle and spruce beetle epidemics and provide many values to the local communities, Colorado and beyond. Temperate forests are diverse ecosystems composed of mixtures of conifers, broad-leaved evergreen and broad-leaved deciduous trees. Generally considered an easy route, it takes an average of 21 min to complete. Some scientists propose that increased soil acidity might be the cause. Search for an answer or ask Weegy. Check out this 0. Projected changes in climate are expected to shift the ranges of many tree species poleward and to higher elevations. The upper margins of tree distribution in mountains around the world have attracted scientists for a long time. Phys-Fest 3 will occur in mid-July (18-23), 2021 at the CSU Mountain Campus west of Fort Collins, CO. This two-mile round trip explores the grassy, sun-drenched summit southeast of the pinnacle, climbing through a mossy, gnarled forest to a high-elevation grassland. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. Denali is also the highest point in North America. Some scientists propose that increased soil acidity might be the cause. Ask a question. elevation regions B. Some scientists propose that increased soil acidity might be the cause. High-elevation forests are important for. In high elevation forests in the Southern Rocky Mountains, North America, areas that are dominated by a single tree species are often adjacent to areas dominated by another tree species. Some maps are so common that a child would recognize them, while others are used only by professionals in specialized fields. The impact of climate variability on forests New York:. Length 0. Proceedings from the conference on the ecology and management of high-elevation forests in the central and southern Appalachian Mountains. Trail Type: Loop. What's this phenomenon? O A. political regions C. Some scientists propose that increased soil acidity might be the cause. Ask a question. tropical forest D. These forests are still recovering from that disturbance. Gen. g(-1) leaf N. elevation. Some scientists propose that increased soil acidity might be the cause. In high-elevation forests in Pennsylvania, ecologists have noticed a serious decline in certain tree species. The phenomenon is: Acid rain, which is caused by SO2 from combustion mixed with atmospheric water vapor. Hike through a gorgeous waterfall-filled stream valley to lofty views on the popular Chimney Tops Trail. 4 (673) Ringing Rocks County Park.