Choose all the answers that apply.

Question

Extrusive igneous rocks _____.

have large mineral crystals
cool slowly
have small mineral crystals
form on the surface
cool quickly
form below the Earth's crust

Answer 1

Extrusive igneous rocks:

• have small mineral crystals
• form on the surface
• cool quickly

These rocks form from lava that cools quickly after erupting on the Earth's surface, resulting in smaller crystals compared to intrusive igneous rocks, which cool slowly below the Earth's surface and typically have larger mineral crystals.