Earth History and Geologic Time
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Geologic Cross Section879 views
Geologic cross section. Letters A through D represent different rock units.
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radioactive decay153 viewsThe table below shows how the radioactive decay of potassium-40 can be used to determine the age of a rock.
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cross sections surface bedrock168 viewsThe cross sections show the surface bedrock in two different locations 20 miles apart. Rock layers are labeled 1, 2, 3, 4, and X. The rock layers have not been overturned.
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Geologic Cross Section445 views
The cross section shows the surface of a landscape region in the southwestern United States and indicates the age, type, and thickness of the bedrock.
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Rock cross section123 viewscross section shows a portion of Earth’s crust.
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Cross section135 viewsThe cross section shows the general bedrock structure of an area containing three different landscape regions, A, B, and C.
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events in the history of Earth156 viewsshows specific events in the history of Earth from the beginning of the universe to the present.
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cross section 107 viewscross section
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Geologic Cross Section151 viewsRock layers A through E have been labeled. Two index fossils are shown and their locations within the rock layers are indicated.
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Cross Section488 views
Geologic cross section of a portion of Earth’s crust
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geologic cross section362 viewsThe rock layers have not been overturned.
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Cross Section145 viewsLetters A through H represent rock units in which overturning has not occurred.
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