The answer is static friction. This is the friction that involves objects that do not move.
Answer:
I attached an image that should help.
Explanation:
Check it out.
Intrusive igneous rocks cool down from magma slowly because they form underneath the surface, that will make them have large crystals.
Extrusive igneous rocks cool down from lava rapidly because they form at the surface, so that will make them have small crystals.