When molten material cools very slowly deep inside Earth, what happens to the size of the crystals?

Question

The crystals are smaller compared to crystals formed closer to Earth’s surface.
The crystals grow at the same rate as those formed closer to Earth’s surface.
The crystals are larger than those formed closer to Earth’s surface.
The crystals are smaller because they form in a hot water solution.

Answer 1

When molten material cools very slowly deep inside the Earth, the crystals that form are larger than those formed closer to the Earth's surface. This is because slower cooling allows more time for the atoms to arrange themselves into a more ordered crystalline structure, resulting in larger crystals. Therefore, the correct answer is:

The crystals are larger than those formed closer to Earth’s surface.