Title |
Comment |
Keywords |
An Oxygen Rich Atmosphere
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19:17 - 19:54 (00:37) / 1.3 MB
|
"blue-green algae", cyanobacteria, oxygen, atmosphere
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Change in Environmental Conditions
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04:59 - 06:49 (01:50) / 2.8 MB
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"Stanley Aramic", fossil, "Alexander Hills", "Eastern California", stromatolite, "sedimentary rock", environment, sand, cyanobacteria, "rate of sedimentation", deposition, precipitation, "calcium carbonate", "Crystal Spring Formation"
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Geology School Keywords
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