1. Rocks: Mineral Mixtures
Chapter 4
Rocks: Mineral Mixtures
Chap 4, Sect 2 (Igneous Rock)
Objectives:
Explain how the cooling rate of magma/lava affects the texture of igneous rock.
Distinguish between igneous rock that cools under Earth’s crust and igneous rock that cools on Earth’s surface.

2. Igneous Rock Classifications
2 Ways Igneous Rock Forms:
_______________________Surface of Earth_______________________
Igneous Rock Classifications
Extrusive
Intrusive i

3. Tech Terms:
magma – molten or hot liquid rock, found under Earth’s surface
lava – molten or hot liquid rock, found on top of Earth’s surface

4. Tech Terms: Igneous Rock intrusive 2. extrusive
forms when magma forms when magma
“intrudes” or pushes “exits” or erupts onto
into surrounding Earth’s surface. (fine-
rock UNDER earth’s grained rock that
surface. (coarse cooled quickly)
grained rock that
cooled slowly)

6. 3 geological process form igneous rocks (draw them below)