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Which is a factor that affects the size of mineral crystals formed in magma?

User Eastonsuo
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The rate at which the magma cools affects the size of the crystals that form. If it cools slowly, large crystals will form. If it cools rapidly, small crystals will form.

Hope this helps!
User Abror Esonaliev
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the volcanic ashes from the volcano
User Andrea Giovacchini
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