Help 10 points!! question about igneous rocks?

Question

Igneous rocks that have large mineral crystals that must have had a long time to grow were mostly likely to have been formed

Which one:

intrusively.

extrusively.

through compaction.

under water.

Answer 1

Intrusively, greater heat and pressure inside of a volcano.

Answer 2

For large crystals to grow, the rock has to cool slowly deep underground, so the rock would be intrusive.

Extrusive igneouse rocks have small grains because they have cooled quickly.

Answer 3

Intrusively.

The slower the cooling process, the bigger the crystals.

Intrusive rocks form beneath the ground where temperatures are higher, so cooling and hardening would take longer, slower.

Answer 4

intrusively.