All of the following are true regarding metal ore EXCEPT:
A) many deposits of minable ore were formed by ancient weathering processes.
B) understanding weathering conditions under which mineral deposits form gives insights into ancient climates.
C) the weathering processes that formed valuable mineral deposits in ancient times no longer operate today.
D) most valuable minerals are abundant in the Earth's crust but are rarely found in their pure form.
Correct Answer:
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Q20: A metal ore is:
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