Question

what is the primary difference between intrusive and extrusive igneous rocks?
○ intrusive rocks form from lava, and extrusive rocks form from magma.
○ intrusive rocks form above ground, and extrusive rocks form below ground.
○ intrusive rocks cool quickly, and extrusive rocks cool slowly.
○ intrusive rocks cool slowly (allowing large crystals), and extrusive rocks cool quickly (resulting in small crystals).

Explanation:

Intrusive igneous rocks form when magma cools and solidifies below Earth's surface, with slow cooling allowing large crystal growth. Extrusive igneous rocks form when lava (magma that reaches the surface) cools quickly above ground, resulting in small crystals. The other options mix up formation locations, cooling rates, and crystal sizes incorrectly.

Answer:

Intrusive rocks cool slowly (allowing large crystals), and extrusive rocks cool quickly (resulting in small crystals).