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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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • Refugia Featured Article Refugia Refugia

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

    • European otter Featured Article European otter European otter

      The European otter (Lutra lutra) is a broadly distributed marine mammal found in both marine and freshwater systems over considerable portions of Europe, Asia and North Africa;... 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 »

    • 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 »

Recently Updated
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 »
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 »
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