Pretest3r2SU23.docx
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11 Terms
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Uniformitarianism
The present is the key to the past.
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Cross cutting relations
The fracture cutting the rocks is younger than the rocks being cut.
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Superposition
False.
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Primary rocks
Sedimentary rock whose clasts were weathered from igneous and metamorphic rock (Hutton).
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Eons order
Hadean, Archean, Proterozoic, Phanerozoic.
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Eon without evidence for life
Hadean.
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Eons with evidence of microbial life alone
Archean, Proterozoic.
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Youngest Eon with three eras
Phanerozoic.
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Half-life of a radioactive element
False.
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Number of half-lives elapsed
Three.
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Age of the rock with a half-life of 20 million years
60 Ma.
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Unit 11: The Industrial Revolution and Imperialism. The division of the world - Point 2
Updated 1078d ago0.0(0)
Unit 11: The Industrial Revolution and Imperialism. The division of the world - Point 2
Updated 1078d ago0.0(0)
