How Rocks Are Made

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

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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

Granite is durable which means it is a good choice for

• cutting tools

• mirrors

• jewelry

• buildings

Weathering is the

• process of rocks breaking down

• melting of rocks

• baking of rocks

• cementing of particles

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Erosion is

• dissolving of minerals

• breaking down of rocks

• movement of sediment to a new location

• evaporation of minerals

Deposition is

• the breaking down of rock

• the cementing of particles

• the pressure of layers of sediment

• the dropping of sediment from wind or water

Tags

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Cementation is the

• pressing together of sediment layers

• transportation of sediment

• baking of rock near magma

• cooling of lava

Tags

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