Question

Crystal size in igneous rocks is determined by?

O A. the speed of tectonic plate movement.
O B. the rate melted rock cools.
O c. magma composition.
O D. the type of magma emplacement.

Answer 1

The answer is the rate melted rock cools.

Step-by-step explanation:

If the rock cools slowly the crystal will be bigger, because it has more time to form. If the rock cools fast the rock will be smaller, because t has less time to form.