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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

    • Dudleya cymosa (Lem.) Britt. & Rose Featured Article Dudleya cymosa (Lem.) Britt. & Rose Dudleya cymosa (Lem.) Britt. & Rose

      Dudleya cymosa (Lem.) Britt. & Rose is a perennial low-growing succulent plant species that is endemic to California. Having a number of subspecies, this fleshy plant is... 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 »

    • 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 »

    • West Nile Virus Featured Article West Nile Virus West Nile Virus

      Since 1999, more than 30,000 people in the United States have been reported as getting sick with West Nile virus. Infected mosquitoes spread West Nile virus (WNV) that can... 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 »

    • 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 »

    • 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 »

Recently Updated
Ecoregions of Panama Last Updated on 2013-05-20 at 02:30 The Ecoregions of Panama are shaped by the jagged elongated geometry of the country, its varied terrain within Mesoamerica and its tropical climate. This key land bridge... More »
Bab el-Mandeb Last Updated on 2013-05-19 at 23:05 The Bab el-Mandeb (Bab al-Mandab) strait (12° 34' 34” North, 43° 21' 11” East) separates Africa (Djibouti and Eritrea), and Asia (Yemen), and... More »
Registan-North Pakistan sandy desert Last Updated on 2013-05-19 at 20:50 The Registan-North Pakistan sandy desert is an ecoregion spanning southern Afghanistan; the extreme eastern portion of Iran; part of northwest Pakistan, covering a total land... More »
Strait of Malacca Last Updated on 2013-05-19 at 18:27 The Strait of Malacca, located between Indonesia, Malaysia, and Singapore, links the Indian Ocean to the South China Sea and Persian Gulf. The length of the strait is about 800... More »
Suez Canal, Egypt Last Updated on 2013-05-16 at 22:09 The Suez Canal, Egypt (30°42?18?N, 32°20?39?E) is one of the world's most important waterways and its Sumed Pipeline is considered a significant... More »
Singapore Last Updated on 2013-05-16 at 21:21 Singapore is a small island nation with over five million people, separated from the southern tip of Peninsular Malaysia by the Straits of Jabor. It is the focal point for... More »
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