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How did you determine which were intrusive and which were extrusive?

How did you determine which were intrusive and which were extrusive?
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How did you determine which were intrusive and which were extrusive?

User Xiaohua
by
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Extrusive rocks cool down quicker so form smaller crystals.

Intrigue rocks cool down slowly so form ther crystals.
User Rumit Parakhiya
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