Intrusive And Extrusive Igneous Rocks

Intrusive And Extrusive Igneous Rocks

Intrusive igneous rocks cool from magma slowly in the crust. They have large crystals. Extrusive igneous rocks cool from lava rapidly at the surface. They have small crystals.

CK-12 (Middle School)

ESSENTIAL QUESTION:

How do scientists classify the two types of igneous rocks?
STANDARDS:
RST.1 - Analysis & Evidence, RST.2 - Main Ideas, RST.4 - Key Terms

DEPTH OF KNOWLEDGE (DOK) LEVELS:

2,3
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