Igneous rocks are classified by Origin, Mineral Composition, and _______.

Question #1b

Hardness Texture Luster

Igneous rocks are classified in what three ways?

Question #1

Igneous rock that forms IN the earth is ________.

Igneous rock that forms when moltenrock EXITS the earth and then cools is

________.

Question #2

A rock that has both large and smallgrains is called ________ .

Porous Coarse-grained Porphyritic

Question #3

The oceanic crust is made mainly fromBasalt, which is cooled lava.

Is Basalt intrusive or extrusive?

Question #4

A B C

Question #5

Which rock likely has the LEAST silica?

The continental crust is made mainlyFrom Granite, which is cooled magma.

Is Granite intrusive or extrusive?

Question #4b

• Question 1: Origin, Texture, Mineral Composition– Question 1b: Texture

• Question 2: Intrusive, Extrusive

• Question 3: Porphyritic

• Question 4: Extrusive– Question 4b: Intrusive

• Question 5: B

Answer Key