Gold makes up a very small percentage (0.0000004%) of the Earth's crust.Why, if gold has been mined for centuries, is 40% of the gold still present in the crust?
A) Only in recent years have humans been able to successfully extract gold from the crust.Previously, only gold blends were removed from the crust.
B) The Earth's crust has a very large mass.A lot of gold has been removed, but a lot remains.
C) Gold is easily recycled, so very little gold is mined each year.
D) It is too expensive to mine gold.
Correct Answer:
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