Expert-reviewed information about the Earth. For everyone.
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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 »
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Featured Video
Jean-Michel Cousteau: use of oil dispersants...
The Rundown caught up with ocean explorer and occasional PBS host Jean-Michel Cousteau to chat about what his team discovered on dives in the aftermath of the Deepwater Horizon... More »
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European otter
The European otter (Lutra lutra) is a broadly distributed marine mammal found in both marine and freshwater systems over considerable portions of Europe, Asia and North Africa;... 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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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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Featured Article
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 »
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 »
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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