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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • Flora of Napa County, California Featured Article Flora of Napa County, California Flora of Napa County, California

      Napa County is a rural county in northern California encompassing nearly 500,000 acres (200,000 hectares), about 0.5 % of the landmass of the state. It is located 25 miles (40... More »

    • Herbivore Featured Article Herbivore Herbivore

      Introduction A herbivore is an animal that obtains its energy and nutrients by feeding on plants.  Different types of herbivores eat different plant parts.  For... More »

Recently Updated
Northwestern thorn scrub forests Last Updated on 2013-05-25 at 15:23 The Northwestern thorn scrub forests ecoregion represents a large expanse of degraded dry forest surrounding the Thar Desert. Neither exceptionally species-rich nor high in... More »
Pakistan Last Updated on 2013-05-25 at 15:06 Pakistan is a nation of one hundred and ninety million people (mid-2013 est.) in southern Asia, bordering the Arabian Sea, between India on the east and Iran and Afghanistan on... More »
Sulu Archipelago rainforests Last Updated on 2013-05-25 at 14:29 Although these islands represent transitional stepping stones from the island of Borneo to Mindanao in the Philippines, they have evolved their own distinctive faunas. The Sulu... More »
Turkish Straits Last Updated on 2013-05-24 at 13:41 The Bosporus and Dardanelles are the Turkish Straits and divide Asia from Europe. The Bosporus is a 17-mile long waterway that connects the Black Sea with the... More »
Dardanelles Last Updated on 2013-05-24 at 13:41 The Dardanelles (formerly known as the Hellespont) is a 38 mile (61 km) long waterway that links the Sea of Marmara (and through the Bosporus Strait, the Black Sea) with the... More »
Panamá Last Updated on 2013-05-24 at 13:23 Panama is a nation of three-and-a-half million people, located between Costa Rica to the north and Columbia to the south. Panama connects the continental land masses of... More »
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