Expert-reviewed information about the Earth. For everyone.
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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 »
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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 »
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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 »
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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 »
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Featured Article
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 »
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 »
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 »
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