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Types of Rocks (Igneous Rocks (Igneous rock begins as magma., Magma can…
Types of Rocks
Igneous Rocks
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Magma can form: When rock is heated, when pressure is released, when rock changes composition.
Magma freezes between 700 C and 1,250 C
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Felsic: light colored rocks that are rich in elements such as aluminum, potassium, silicon, and sodium.
Mafic: dark colored rocks that are rich in calcium, iron, and magnesium, poor in silicon.
Coarse-grained: takes longer to cool, giving mineral crystals more time to grow
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Sedimentary Rocks
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Sediments are deposited in layers, with the older ones on the bottom.
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Metamorphic Rock
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Changes with temperature and pressure, but remains solid
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Increased temperature changes the composition of the rock, minerals are changed into new minerals.
Large pieces of the Earth's crust collide and the rock is deformed and chemically changed by heat and pressure.
What are Rocks
A rock is a naturally occurring solid mixture of one or more minerals, or organic matter.
Rocks are classified by how they are formed, their composition, and texture.
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Extrusive Rocks
Forms when magma erupts onto Earth's surface (lava), cools quickly with very small or no crystals formed.
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