Title |
Comment |
Keywords |
Minerals Formed By Biologic Processes
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24:25 - 24:45 (00:20) / 0.4 MB
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mineral, "biological activity", oyster, pearl, sponge, coral, "calcium carbonate", "sea water", precipitation, calcite, aragonite
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Sediment
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02:31 - 03:22 (00:51) / 1.0 MB
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sediment, "mechanical weathering", "chemical weathering", erosion, wind, water, ice, "biological activity", sand, dune, beach, pebble, stream, shell, "sea floor", compaction, cementation, "sedimentary rock"
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Biological Contribution
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07:42 - 08:56 (01:14) / 1.3 MB
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"sedimentary rock", "chemical sedimentation", ocean, "biological activity", algae, coral, invertebrate, "calcium carbonate", shell, reef, "sea floor", limestone, fossil, chalk, plant, animal, life, "continental shelf", radiolaria, diatom, silica, chert, diatomite
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Desert Varnish
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16:42 - 18:16 (01:34) / 3.5 MB
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"Richard Hazlett", desert, "desert varnish", "manganese oxide", clay, weathering, evaporation, precipitation, "acid rain", "chemical weathering", rainfall, microbe, "biological activity"
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Ice Core Analysis
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21:09 - 22:12 (01:03) / 1.5 MB
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"Greenland Ice Core Program", Greenland, "ice core", "State University of New York - Buffalo", "gas composition", glacier, "glacial ice", nitrogen, oxygen, atmosphere, "Greenhouse Effect", methane, "carbon dioxide", "Ice Age", "biological activity"
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Geology School Keywords
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