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May 10, 2013 09:05PM

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amazing !
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Documentation on the Seine barges in the 17th century is scant, but apparently m...

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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • Earth's atmosphere Featured Article Earth's atmosphere Earth's atmosphere

      The Earth's atmosphere is an envelope of gas that surrounds the Earth and extends from the Earth's surface out thousands of kilometres, becoming increasingly thinner (less dense)... More »

Recently Updated
Western Java rainforests Last Updated on 2013-05-25 at 23:43 The Western Java rainforests are found on one of the most active volcanic islands in the world. Once the home of the extinct Javan Tiger (Panthera tigris sondaicus), these... More »
Temperate rainforests Last Updated on 2013-05-25 at 21:50 This article draws upon the work of numerous writers, published by Ecotrust in the cited works below, and was also contributed to by Malka Geffen of Ecotrust.... More »
Fossil fuel Last Updated on 2013-05-25 at 21:07 Introduction Fossil fuel is any naturally occurring carbon compound found in the Earth's crust that has been produced by anaerobic conditions and high... More »
Rooftop runoff contamination Last Updated on 2013-05-25 at 19:49 [The lead author of this article is Dennis Lye] Rooftop runoff contamination is receiving increasing attention as environmental and health issues, particularly as human... More »
Niger River Last Updated on 2013-05-25 at 17:50 The Niger River is the third largest river in Africa, and the fourteenth longest river in the world. Rising in the Guinea Highlands, the river flows 4,200 kilometres through... More »
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 »
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