Answer the following question given this paragraph: 

Cooling and crystallization. Deep within the Earth, temperatures can get hot enough to create magma. As magma cools, crystals grow, forming an igneous rock. The crystals grow larger if the magma cools slowly, as it does if it remains deep within the Earth. If the magma cools quickly, the crystals will be very small. When crystals form from magma it is called crystallization .


Q: What is it called when crystals form from magma?

 Choices:

- sedimentation

- transpiration

- vulcanism

- crystallization

A:
crystallization
