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Expert-reviewed information about the Earth.  For everyone.

    • Argon Featured Article Argon Argon

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    • 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 »

    • Serengeti Featured Article Serengeti Serengeti

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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 »

    • 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 »

    • 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 »

    • 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 »

    • 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 »

    • Algae Featured Article Algae Algae

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Recently Updated
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 »
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 »
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