News tagged with soil
Related topics: plants , climate change , nitrogen , atmosphere , carbon
Soil 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.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Authorities are investigating rice mills in southern China following tests that found almost half of the staple grain in one of the country's largest cities was contaminated with a toxic metal.
Health May 21, 2013 | 5 / 5 (1) | 0
Ten years after the Iraq war of 2003 a team of scientists based in Mosul, northern Iraq, have detected high levels of uranium contamination in soil samples at three sites in the province of Nineveh which, coupled with dramatically ...
Health May 21, 2013 | not rated yet | 0
On 31 March 2013, the Chinese National Health and Family Planning Commission announced human cases of novel H7N9 influenza virus infections. A group of scientists, led by Professor Chen Hualan of the Harbin ...
Diseases, Conditions, Syndromes May 13, 2013 | not rated yet | 0
Cancer spread or metastasis can strike unprecedented fear in the minds of cancer patients. The "seed and the soil" hypothesis proposed by Stephen Paget in 1889 is now widely accepted to explain how cancer cells (seeds) are ...
Cancer Apr 30, 2013 | 5 / 5 (1) | 0
In March 2013, a novel H7N9 influenza virus was identified in China as the etiological agent of a flu-like disease in humans, resulting in some deaths. A group of scientists, led by Professor Chen Hualan (National Avian Influenza ...
Diseases, Conditions, Syndromes Apr 25, 2013 | not rated yet | 0