Which of the following statements best describe what geologists refer to as rock-forming minerals?
A. The minerals that form after a rock has already turned into a solid.
B. The minerals found in rocks that are the most durable and hard.
C. The minerals that were present in the original rocks that cooled to form Earth's crust.
D. The few dozen or so minerals that make up most of the rocks in Earth's crust.
E. Consist of over 4,000 types of minerals that make up most of the rocks in Earth's crust.
Answer: D
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