Rocks

Amanda Roe, Brittany Earnhardt

What it is

Earth materials change back and forth among the different types of rocks. It also involves rocks in the earths crust
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Explanation

Rocks change from one form to another due to the weather, rain, hail, sleet, and sun can change the way a rock is formed.

3 Types of rocks

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Igneous rock

formed from the cooling of either magma or lava. The appearance is usually smooth and shiny

Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.

Example rock: gabbro

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Metamorphic rock

Rock that have changed due to intense temperature and pressure.

Granulite is a metamorphic rock that is formed from the igneous rock basalt

Characteristics may include, display foliation, which is the layering, banding, or platiness that is associated with the rearrangement of mineral crystals due to directional pressure

Example rock: Marble

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Sedimentary rock

Rock fragments; mineral grains; animal and giant remains that are pressed or cemented together.

Sedimentary rocks are formed by sediment that is deposited over time, usually as layers at the bottom of lakes and oceans.

The characteristics are sandstone, clastic, vary greatly in size and how they feel and look.

Example rock: Sandstone