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Biology 20 Online
OpenStudy (coledrf):

Which of the following is true about rocks? (1 point)Rocks are composed of only one mineral. Rocks do not contain any nonmineral matter. Coal is not considered a true rock. Most rocks are a mixture of minerals.

OpenStudy (elcna):

I think D. :)

OpenStudy (coledrf):

correct thank you! @elcna

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