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 Article
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
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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Featured Article
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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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 »
Turkish Straits
Last Updated on 2013-05-24 at 13:41
The Bosporus and Dardanelles are the Turkish Straits and divide Asia from Europe.
The Bosporus is a 17-mile long waterway that connects the Black Sea with the... More »
Dardanelles
Last Updated on 2013-05-24 at 13:41
The Dardanelles (formerly known as the Hellespont) is a 38 mile (61 km) long waterway that links the Sea of Marmara (and through the Bosporus Strait, the Black Sea) with the... More »
Panamá
Last Updated on 2013-05-24 at 13:23
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 masses of... More »
Isthmus of Panama
Last Updated on 2013-05-24 at 13:10
The Isthmus of Panama (sometimes known as the Isthmus of Darien), a narrow strip of land connecting the continents of North and South America. The Isthmas in crossed by the... More »
Sumatran lowland rainforests
Last Updated on 2013-05-24 at 00:32
The Sumatran lowland rainforests are one of the most diverse forests on Earth and also among the most threatened.
These forests contain comparable levels of More »
Extraterrestrial soils
Last Updated on 2013-05-23 at 18:48
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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