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    • Ecological pyramids Featured Article Ecological pyramids Ecological pyramids

      Ecological pyramids are diagrams that illustrate how ecologically important factors, such as energy, biomass, and population size, vary between trophic levels in an ecosystem.... 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 »

    • 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 »

    • Sulfur Featured Article Sulfur Sulfur

      Sulfur (alternatively spelled sulphur) is the chemical element with  atomic number 16. The chemical symbol S is used in formulae and abbreviations. Sulfur has high abundance... More »

    • 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 »

    • Jamaican dry forests Featured Article Jamaican dry forests Jamaican dry forests

      Jamaican dry forests is an ecoregion that covers a minority of the land area of the nation island of Jamaica, which ranks fifth among the Earth's islands in terms of endemic plant... 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 »

Recently Updated
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 »
Isthmus of Panama Last Updated on 2013-05-24 at 13:10 The Isthmus of Panama (sometimes known as the Isthmus of Darien), a narrow strip of land connecting the continents of North and South America. The Isthmas in crossed by the... More »
Sumatran lowland rainforests Last Updated on 2013-05-24 at 00:32 The Sumatran lowland rainforests are one of the most diverse forests on Earth and also among the most threatened. These forests contain comparable levels of More »
Extraterrestrial soils Last Updated on 2013-05-23 at 18:48 Extraterrestrial soils may be defined as any of the solid granular crustal features of planets and moon other than those soils on planet Earth. Despite four decades of space... More »
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