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from article Continental drift
Map of the Earth as Pangea broke up as a result of continental drift. (Copyright © McGraw-Hill)
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from article Dairy cattle production
Modern machinery is used in the production of milk. (Credit: Yadamons/Getty Images)
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from article Dairy cattle production
A typical dairy cattle farm in northeast Iowa. (Credit: Lynn Betts/Natural Resources Conservation Service, U.S. Department of Agriculture)
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from article Dairy cattle production
Holstein dairy cattle in Washington County, Virginia. (Credit: Jeff Vanuga/Natural Resources Conservation Service, U.S. Department of Agriculture)
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from article Agricultural aircraft
An agricultural aircraft applying pesticide over a field. (Credit: BrianBrownImages/Getty Images)
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from article Agricultural aircraft
Application equipment for fixed-wing agricultural aircraft. The spraying equipment is shown on the aircraft, and a ram-air-type spreader for dry materials is shown below the aircraft.
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from article Agricultural aircraft
Application equipment for rotary-wing agricultural aircraft. (a) Helicopter with spray equipment attached. (b) Dry equipment. (c) Detail of hopper and spinner.
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from article Sturgeon
Shovelnose sturgeon (Scaphirhynchus platorynchus). (Photo by Konrad Schmidt)
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from article Stalactites and stalagmites
Stalactite and stalagmite deposits. Along the central opening are deposits made by water as it dripped from the crack in the limestone. Outside layers were deposited by water flowing over the surface. Water may drip to the floor and create a…
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from article Star
A view of the night sky from Cerro Paranal in the Atacama Desert in Chile. The bright star at top left is Sirius, the brightest star other than the Sun as seen from Earth. The bright star at right is Canopus, which happens to be the second brightest…
