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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

    • Rooftop runoff contamination Featured Article Rooftop runoff contamination Rooftop runoff contamination

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    • 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 »

    • 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 »

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      Refugia (singular Refugium) are geographical locations where natural environmental conditions have remained relatively constant or stable during times of great environmental... More »

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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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