13. Which of the following is true about rocks?
A. Rocks are composed of only one mineral.
B. Most rocks are a mixture of minerals.
C. Rocks do not contain minerals.
D. Coal is not considered a rock.
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13. Which of the following is true about rocks?
A. Rocks are composed of only one mineral.
B. Most rocks are a mixture of minerals.
C. Rocks do not contain minerals.
D. Coal is not considered a rock.
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Answer:
B
Explanation:
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