The geologic time scale was originally based upon

a. changes in the Earth’s biota.
b. the theory of organic evolution.
c. the isotopes of minerals.
d. absolute ages of rocks based on radiometric age dates.
e. geographic mineral locations


A

Environmental & Atmospheric Sciences

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Ice cores for climate analysis are drawn from:

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A) Over oceans B) Over high mountains C) Over high latitudes D) Over tropical latitudes E) Equally over any latitude

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