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Credit: Luc Viatour
Grasslands are found in most ecoregions of the Earth. Above are grasslands near Elsrickle, South Lanarkshire, Great Britain.
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Credit: Lynn Betts, USDA Natural Resources Conservation Service
Topsoil is the upper, outermost layer of soil, usually the top 2 inches (5.1 cm) to 8 inches (20 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Pictured: Terraces, conservation tillage, and conservation buffers save soil, control erosion and improve water quality on this Iowa farm. 1999.
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Credit: Composite image created by User:Medeis
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Credit: U.S. Fish and Wildlife Service
Drawing of an American paddlefish (Polyodon spathula). Also called the Mississippi paddlefish or spoonbill, they live in slow-flowing waters of the Mississippi River drainage system and may grow to 7 feet (220 cm) and weigh up to 220 pounds (100 kg). They appear to have been extirpated from Lake Erie and its tributaries.
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Credit: User:Nhobgood
Ocellaris clownfish often live symbiotically with the Heteractis magnifica sea anemone, using them for shelter and protection.
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Quảng Ninh province, Vietnam. Horseshoe crabs are arthropods that live primarily in shallow ocean waters on soft sandy or muddy bottoms.
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Credit: U.S. Navy
Three polar bears approach the USS Honolulu (SSN-718), 280 miles from the North Pole. Polar bears have adapted through the process of evolution to have white fur that matches the white, icy arctic tundra.
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Credit: Jon Sullivan
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Credit: U.S. Geological Survey
An animation of the Earth's hypothesized Pangaea separation. Pangaea is hypothesized as a supercontinent that existed during the Paleozoic and Mesozoic eras about 250 million years ago, before the component continents were separated into their current configuration.
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Credit: User:Krokodild
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Credit: User:God of War
A rocky stream in Hawaii, an example of a riparian zone. A riparian zone or riparian area is the interface between land and a river or stream.
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Schooling bigeye trevally. In biology, any group of fish that stay together for social reasons are said to be shoaling and if the group is swimming in the same direction in a coordinated manner, they are said to be schooling.
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Credit: Martin St-Amant
The Iguazu Falls, on the border of Brazil and Argentina are waterfalls of the Iguazu River located on the border of the Brazilian State of Paraná and the Argentine Province of Misiones.