igneous rocks

IgneousRocks

B. Igneous Rocks1. Form from the ______ and __________ of

either ______ (molten rock that is deep underground) or ____ (molten rock that is on or near the Earth’s surface).

cooling solidificationmagma

lava

2) Classified based on Two qualities:a) Texture:

Ex) Pumice feels rough because escaping gases left air holes or vesicles in it as it cooled, but it cooled so quickly that NO mineral crystals were able to form. Pumice has a “Glassy” texture.

i. An igneous rock that has small crystals will have cooled _____ and at or near the Earth’s ________. These are __________ igneous rocks.

How large the crystals are, not how they feel.

fastsurface extrusive

Extrusive Igneous Rocks

Basalt

ii. An igneous rock that has large, visible crystals will have cooled _____ and deep underground. These are ________ igneous rocks.

slowlyintrusive

Granite

iii. An extrusive rock that cools while gas is escaping through, leaving air pockets or vesicles (holes) is called ________. Ex) Pumice & Scoria.

vesicular

Pumice SCORIA

Identify these rocks

Granite

Pumice

Basalt