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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.
Waterlogged wood is a wooden object that has been submerged or partially submerged in water and has affected the original intended purpose or look of the object. Waterlogged wood objects can also include wood found within moist soil from archaeological sites, underwater archaeology, maritime debris, or damaged wood objects.
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.
Floodwaters are receding in Vermont, but they're leaving a coating of mud that has to be cleaned up.
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.
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]
In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil that fuse ...
A COLE value of 0.06 means that 100 inches of soil will expand by 6 inches when wet. [2] Soils with this shrink-swell capacity fall under the soil order of Vertisols . [ 6 ] As these soils dry, deep cracks can form on the surface, which then allows water to penetrate to deeper levels of the soil. [ 7 ]