I think that a) is chemical, and b) would be chemical
Answer:
Explanation:
Because extrusive rocks cool quickly, they only have time to form very small crystals such as basalt or none at all. On the other hand, intrusive rocks grow larger crystals because they take longer to cool. Extrusive rocks are usually fine-grained or glassy while intrusive rocks are coarse-grained.
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This may help you on your en devours. This question truly doesn't make any sense to me... <span />
