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Soil erosion is the denudation or wearing away of the upper layer of soil. It is a form of soil degradation . This natural process is caused by the dynamic activity of erosive agents, that is, water , ice (glaciers), snow , air (wind), plants , and animals (including humans ).
The stream erodes away at the rock and soil at its headwaters in the opposite direction that it flows. Once a stream has begun to cut back, the erosion is sped up by the steep gradient the water is flowing down. As water erodes a path from its headwaters to its mouth at a standing body of water, it tries to cut an ever-shallower path.
It shelters the soil from winds, which results in decreased wind erosion, as well as advantageous changes in microclimate. The roots of the plants bind the soil together, and interweave with other roots, forming a more solid mass that is less susceptible to both water [64] and wind erosion. The removal of vegetation increases the rate of ...
Soil regeneration is the reformation of degraded soil through biological, chemical, and or physical processes. [ 2 ] When productivity declined in the low-clay soils of northern Thailand, farmers initially responded by adding organic matter from termite mounds , but this was unsustainable in the long-term.
"You get left with soil at the end, and that's the really neat part is what you do with the soil," he said. "You can keep it, you can scatter it, you can plant it, and a lot of families donate the ...
Internal erosion is the formation of voids within a soil caused by the removal of material by seepage. [1] It is the second most common cause of failure in levees and one of the leading causes of failures in earth dams, [2] responsible for about half of embankment dam failures. [3]
Understanding the principle of isostasy is a key element to understanding the interactions and feedbacks shared between erosion and tectonics. The principle of isostasy states that when free to move vertically, lithosphere floats at an appropriate level in the asthenosphere so that the pressure at a depth of compensation in the asthenosphere well below the base of the lithosphere is the same. [3]
There are several reasons why — the main factors being lack of sun exposure (the body produces vitamin D when exposed to the sun’s ultraviolet light), location, age and skin color, explains ...