Chp 3 Igneous Rocks

Question 1

What is a rock?

Answer 1

A rock is a naturally formed, consolidated material usually composed of grains of one or more minerals.

Question 2

Describe the rock cycle.

Answer 2

Shows how one type of rock material gets transferred into another type.

Question 3

Notes about the rock cycle:

Answer 3

• All types of rocks are made from each other except igneous rocks.

Question 5

How are Igneous rocks formed?

Answer 5

When magma cools

Question 6

Describe the textures of Igneous rocks.

Answer 6

They can be coarse-grained which means formed by slow-cooling magma. Course-grained igneous rocks are also intrusive and phaneritic.

They can be fine-grained which means that they are formed by rapid cooling magma. Phanertic rocks have also large visible crystals.

Question 7

Describe the chemical composition of Igneous rocks.

Answer 7

Igneous rocks can be either felsic or mafic.
Mafic has high iron and magnesium content.
Felsic are majority non Fe, Mg

Question 8

Describe Bowen’s reaction series