Rock Types

Luster is another word for

• glassy

• shine

• sandy

• smooth

Intrusive igneous rocks form from

• magma cooling

• lava cooling

• heat and pressure

• weathering and cementing

Intrusive igneous rocks

• are baked

• cool quickly

• cool slowly

• are cemented particles

If a rock cools slowly, it may

• preserve dinosaur bones

• have chunks of pebbles

• be smooth as glass

• form crystals

Extrusive igneous rocks

• cool from magma

• cool from lava

• are pressed particles

• dissolve in water

The only igneous rock that can float is

• obsidian

• gabbro

• pumice

• diorite

Obsidian has been used for

• tools and jewelry

• a powder cleaner for scrubbing

• a building material

• for coins

Granite is durable which means it is a good choice for

• cutting tools

• mirrors

• jewelry

• buildings

Pumice can be used for

• bricks for building

• softening skin

• tiles

• cutting

Weathering is the

• process of rocks breaking down

• melting of rocks

• baking of rocks

• cementing of particles