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
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An unconfined aquifer lacks a(n)
A. aquitard above. B. recharge area. C. zone of saturations. D. water table.
A very large cave or system of interconnected caves is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s)
Ice cores for climate analysis are drawn from:
a. Iceland and Greenland. b. the Arctic and the Antarctic. c. Greenland and the Arctic. d. Antarctic and Greenland.
As a group of places, where are thunderstorms most common?
A) Over oceans B) Over high mountains C) Over high latitudes D) Over tropical latitudes E) Equally over any latitude