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Expert-reviewed information about the Earth.  For everyone.

    • 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 »

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    • 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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      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 »

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      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 »

Recently Updated
Redwood Sorrel Last Updated on 2013-05-20 at 18:13 Redwood Sorrel (Oxalis oregana) Redwood Sorrel is in the Oxalidaceae, the wood sorrel family, a relatively small family with three genera and 875 species of mostly tropical... More »
Suez Canal, Egypt Last Updated on 2013-05-20 at 13:48 The Suez Canal is located in Egypt west of the Sinai Peninsula, connects Port Said on the Mediterranean Sea with the port of Suez on the Red Sea, and provides an essentially... More »
Strait of Hormuz Last Updated on 2013-05-20 at 13:48 Located between Oman and Iran, the Strait of Hormuz (26°34'0.00"N,  56°15'0.00"E) connects the Persian Gulf with the Gulf of Oman and the Arabian... More »
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 »
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