how is the size of a mineral grains affected by the rate at which molten material cools?

Question

earth science rocks

Answer 1

the faster a magma cools the finer or smaller the grain size of the rock
the slower a magma cools the coarser or larger the grain size of the rock

Answer 2

Fast cooling (also known as quenching) limits the size of grains. They cool quickly and dont have "time" to line up their lattice structures. Molten material that cools slowly allows time for moelcules to align in a regular pattern and thus the grains will grow longer as more and more molecules line up.

Answer 3

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