The 3 Types of RockThe 3 Types of Rock

Let’s Practice….Let’s Practice….

1. Is It a Rock?• Write down the names of the following items that

you believe are rocks:

2. Explain your thinking. What “rule” or reasoning did you use to decide if something is a rock?

Cement block Piece of clay pot Coal

Dried mud Coral brick

Hardened lava Limestone A gravestone

Asphalt (road tar) Iron ore Marble statue

Glass Concrete granite

A

B

CG

H

E

I

DF

Igneous RockIgneous Rock• Rock that forms when hot, liquid rock, or

__________, cools and solidifies.

• Examples:

magma

Igneous Rock

Intrusive Igneous Rock

Extrusive Igneous Rock

Formed BELOW the Earth’s

surface

Formed ON the

Earth’s surface

Sedimentary Rock• Forms when layers of _________ are compacted

and cemented together.

– Most noticeable feature = layers, or _______.

• Examples:

strata

sediment

Metamorphic RockMetamorphic Rock

• “Metamorphism” means ____________.

• The structure, texture, or composition (what it’s made of) of the rock has changed.

to change

Textures of Metamorphic Rock

Foliated Nonfoliated

Mineral grains arranged in

bands or straight lines

Mineral grains NOT arranged in

bands or straight lines