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Expert-reviewed information about the Earth.  For everyone.

    • Argon Featured Article Argon Argon

      Argon is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present... More »

    • Nuclear power Featured Article Nuclear power Nuclear power

      Nuclear power is the generation of electricity from controlled reactions within the nucleii of atoms that release energy used to boil water, the steam from which drives a... More »

    • Algae Featured Article Algae Algae

      Introduction Algae comprise a diverse group of typically autotrophic organisms, ranging from unicellular to multicellular forms. The largest and most complex marine forms... More »

    • Douglas-fir Featured Article Douglas-fir Douglas-fir

      The Douglas-fir (scientific name: Pseudotsuga) is a genus of tree that includes ar least five species found in North America and... More »

    • Biomass Featured Article Biomass Biomass

      Biomass is a term in ecology for the  mass of living organisms in a given ecosystem.  Biomass can refer to the living stock of species in a given habitat, but can... More »

    • Serengeti Featured Article Serengeti Serengeti

      The Serengeti is a plain immediately south of the equator in eastern Africa covering over 30,000 square kilometers (12,000 square miles) east of Lake Victoria in northwestern... More »

    • Petrochemicals Featured Article Petrochemicals Petrochemicals

      Petrochemicals are chemical products made from the hydrocarbons present in raw natural gas and petroleum crude oil. The largest petrochemical manufacturing industries are to... More »

    • Virus Featured Article Virus Virus

      A virus is a microscopic organism that can replicate only inside the cells of a host organism. Most viruses are so tiny they are only observable with at least a conventional... More »

    • DNA Featured Article DNA DNA

      Deoxyribonucleic acid (DNA) is a long chain organic molecule that contains the coding for all metabolic and reproductive processes of all living organisms, save for certain... More »

Recently Updated
Great Basin shrub steppe Last Updated on 2013-06-18 at 04:23 The Great Basin shrub steppe ecoregion is situated in the most northerly of the four American deserts. Unlike the other three, which have almost exclusive ties to... More »
Nonpoint source Last Updated on 2013-06-18 at 02:18 A nonpoint source refers to a source of pollution from an origin other than a well defined point. The term is most often applied to air pollution, water pollution and noise... More »
Tamarix control Last Updated on 2013-06-17 at 17:10 Tamarix control is a significant invasive species issue in the western USA, especially in the American southwest.  The woody plant genus Tamarix, also , also known by the... More »
Chihuahuan Desert Last Updated on 2013-06-16 at 21:48 The Chihuahuan Desert encompasses one of the most biologically diverse arid regions on Earth. This ecoregion extends from within the United States south into Mexico. This... More »
Colorado Plateau shrublands Last Updated on 2013-06-16 at 21:44   The Grand Canyon epitomizes the Colorado Plateau, an area that has been called the "land of color and canyons." The Plateau can be thought of as an... More »
Mojave Desert Last Updated on 2013-06-16 at 21:42 The Mojave Desert is the smallest of the four American deserts. While the Mojave lies between the Great Basin Shrub Steppe and the Sonoran desert, its fauna is more closely... More »
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