Soil
hideSoil is a natural body consisting of layers (soil horizons) of mineral constituents of variable thicknesses, which differ from the parent materials in their morphological, physical, chemical, and mineralogical characteristics. It is composed of particles of broken rock that have been altered by chemical and environmental processes that include weathering and erosion. Soil differs from its parent rock due to interactions between the lithosphere, hydrosphere, atmosphere, and the biosphere. It is a mixture of mineral and organic constituents that are in solid, gaseous and aqueous states. Soil particles pack loosely, forming a soil structure filled with pore spaces. These pores contain sol solution (liquid) and air (gas). Accordingly, soils are often treated as a three state system. Most soils have a density between 1 and 2 g/cm³. Soil is also known as earth: it is the substance from which our planet takes its name. Little of the soil composition of planet Earth is older than Tertiary and most no older than Pleistocene. In engineering, soil is referred to as regolith, or loose rock material.
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News tagged with soil
ARS Explores Ways to Keep Carbon in the Soil
Dec 03, 2009 |
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(PhysOrg.com) -- Agricultural Research Service (ARS) scientists are testing out alternative ways of tilling the soil and rotating crops to see if they can help wheat farmers in Oregon sequester more carbon ...
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Computer model reveals where food pathogens grow
19 hours ago |
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(PhysOrg.com) -- An outbreak of food-related illness, such as E. coli-tainted spinach, often leaves food safety experts scratching their heads over the source of the contamination.
Sandtrapped Rover Makes a Big Discovery
Space & Earth / Space Exploration
20 hours ago |
4.9 / 5 (35) |
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Homer's Iliad tells the story of Troy, a city besieged by the Greeks in the Trojan War. Today, a lone robot sits besieged in the sands of Troy while engineers and scientists plot its escape.
Elevated CO2 levels may mitigate losses of biodiversity from nitrogen pollution
22 hours ago |
3.5 / 5 (6) |
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Rising levels of carbon dioxide may overheat the planet and cause other environmental problems, but fears that rising CO2 levels could directly reduce plant biodiversity can be allayed, according to a new study by a University ...
2 heads better than 1 in new antibiotic method
23 hours ago |
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An antibiotic that binds to a well-established target in a novel and unexpected way could be the inspiration for designing new, more potent antibacterial drugs.
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