Chapter 3 Section 2 Igneous Rocks. From the core of the continents to nearly all of the oceanic crust—igneous is everywhere!. IGNEOUS ROCKS. magma lava. “fire” rocks. cooling. andesite. pumice. Formed from cooled/hardened _________ or ______
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Chapter 3 Section 2 Igneous Rocks
From the core of the continents to
nearly all of the oceanic crust—igneous is everywhere!
Formed from cooled/hardened _________ or ______
Are called _______________ [ignis Latinfire]
The rate of __________ determines the size of the mineral’s crystals.
INtrusive: below groundcools slower many many &large crystals
Ex: granite, gabbro
EXtrusive: above groundcools quicker f e w &small crystals
Air bubbles are sometimes trapped (pumice, scoria)
crystallize randomly distributed
glassy appearance (tiny crystals)
different rates of cooling
fine grained minerals