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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 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 Lake
MODIS (MODerate-resolution Imaging Spectroradiometer) Terra satellite image of the Great Lakes, September 15, 2015. (Credit: NOAA Great Lakes CoastWatch)
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from article Lake
Oxbows in Bolivia. Landsat satellite image of the Beni River in Bolivia, which resembles a blue ribbon as it flows toward the Amazon River. Scattered along the river are numerous oxbow lakes, which are curved bodies of water that form when a meander…
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from article Oil shale
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from article Oil shale
C-13 nuclear magnetic resonance characterization of organic matter in two United States oil shale samples. (a) Colorado oil shale, 80% aliphatic carbon content with 69% conversion of organic carbon to oil. (b) Kentucky oil shale, 52% aliphatic…
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from article Oil shale
Oil shale deposits of the United States. (Courtesy of John Ward Smith)
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from article Oil shale
Oil shale retorting systems: (a) internally heated, (b) externally heated.
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from article Camel
Bactrian camel (Camelus bactrianus). (Photo courtesy of Brent Huffman, Ultimate Ungulate Images)
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from article Hydrothermal vent
Black smoker plume at a hydrothermal vent. Black smoker vents are distinguished by the presence of such large quantities of minute mineral particles that the plumes become virtually opaque. The minerals solidify as they cool, forming chimney-like…
