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Difficult Run is a 15.9-mile-long (25.6 km) [1] tributary stream of the Potomac River in Northern Virginia in the United States. [2]The stream is part of a 57.7-square-mile drainage basin, or watershed, in the north-central portion of Fairfax County, Virginia.
Areas sometimes included when referencing the Appalachian region. Northern section is generally not included. Environmental issues in Appalachia, a cultural region in the Eastern United States, include long term and ongoing environmental impact from human activity, and specific incidents of environmental harm such as environmental disasters related to mining.
Antique Dutch windmills used to pump water into the embanked river to prevent waterlogging of the lowlands behind them. Waterlogging water is the saturation of soil with water. [1] Soil may be regarded as waterlogged when it is nearly saturated with water much of the time such that its air phase is restricted and anaerobic conditions prevail.
As the Potomac River approaches the Blue Ridge on the eastern edge of the Shenandoah Valley, the river turns to the south paralleling the ridge to Bolivar, West Virginia, where it then cuts east, past Harpers Ferry to its confluence with the Shenandoah River at the western edge of the first gap between Blue Ridge Mountain to the south in Virginia and West Virginia and Elk Ridge Mountain to the ...
The climate of Virginia varies according to location, and becomes increasingly warmer and humid farther south and east. [19] Most of the state has a humid subtropical climate, from the Blue Ridge Mountains and southern Shenandoah Valley to the Atlantic coast. In the Blue Ridge Mountains, the climate becomes subtropical highland. [citation needed]
where water tables are shallow, the irrigation applications are reduced. As a result, the soil is no longer leached and soil salinity problems develop; stagnant water tables at the soil surface are known to increase the incidence of water-borne diseases like malaria, filariasis, yellow fever, dengue, and schistosomiasis (Bilharzia) in many ...
The Rivanna River / r ɪ ˈ v æ n ə / is a 42.1-mile-long (67.8 km) [1] tributary of the James River in central Virginia in the United States. The Rivanna's tributaries originate in the Blue Ridge Mountains ; via the James River, it is part of the watershed of Chesapeake Bay .
Heating of solids, sunlight and shade in different altitudinal zones (Northern hemisphere) [5] A variety of environmental factors determines the boundaries of altitudinal zones found on mountains, ranging from direct effects of temperature and precipitation to indirect characteristics of the mountain itself, as well as biological interactions of the species.