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Expert-reviewed information about the Earth. For everyone.
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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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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 »
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Featured Gallery
Cabo de Gata-Nijar Natural Park, Andalucia,...
Cabo de Gata-Nijar Natural Park lies along the Alboran Sea of the Mediterranean coast of Andalucia, Spain. The most arid area in the entirety of Europe, it boasts varied... 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 »
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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 »
Balsam fir
Last Updated on 2013-05-21 at 17:28
This plant guide on the Balsam fir, Pinus balsamea L., was chiefly prepared and contributed by the U.S. Department of Agriculture's Natural Resources Conservation... More »
Hawaii tropical dry forests
Last Updated on 2013-05-21 at 16:59
Hawaii tropical dry forests typically occur on the leeward side of the principal Hawaiian Islands (that is the side not exposed to the prevailing winds as they come ashore),... More »
Mesoamerican Gulf-Caribbean mangroves
Last Updated on 2013-05-21 at 15:19
The Mesoamerican Gulf-Caribbean mangroves occupy a long expanse of disjunctive coastal zone along the Caribbean Sea and Gulf of Mexico for portions of Central America and... More »
Bosporus Straits, Turkey
Last Updated on 2013-05-21 at 12:23
The Bosporus or Bosphorus (also known as the Istanbul Strait) is a strait connecting the Black Sea with the Sea of Marmara (and beyond it, through the Dardenelles to the... More »
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 »
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