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Expert-reviewed information about the Earth.  For everyone.

    • Panamá Featured Article Panamá Panamá

        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... 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

Recently Updated
Dollar Value of Ecosystem Services Last Updated on 2013-05-20 at 05:42 The value of ecosystem services typically goes unaccounted for in business and policy decisions and in market prices. For commercial purposes, if ecosystem services are... More »
Biodiversity Glossary Last Updated on 2013-05-20 at 04:41 Introduction A biodiversity glossary is presented herein, to aid in understanding the many facets of a topic important to scientists, policy makers and the public.... More »
Estimation of adult human biomass Last Updated on 2013-05-20 at 04:30 The energy requirement of species at each trophic level is a function of the number of organisms and their average mass. The study estimates global human biomass, its... More »
Extraterrestrial soils Last Updated on 2013-05-20 at 04:04 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 »
Eastern Miombo woodlands Last Updated on 2013-05-20 at 03:31 Confined to the lower elevations of the Central African Plateau, the Eastern Miombo woodland ecoregion ranges from southern Tanzania to northern Mozambique and... More »
Northern Africa Last Updated on 2013-05-20 at 03:17     Ecoregions in Northern Africa PA1212    Mediterranean acacia-argania dry woodlands and succulent... More »
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