Rocks

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Rocks
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Types of Rocks
Metamorphic Rocks
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Igneous RocksWhat are They?

• Fire Rocks
• Formed underground by trapped, cooled magma or
  above ground when volcanoes erupt and lava cools

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Types of Igneous Rocks
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Sedimentary RocksHow They are Made

• Particles of other rocks or the remains of plants
  and animals are pressed and cemented together
• Forms in layers below the surface

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Types of Sedimentary Rocks
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Metamorphic RocksWhat are They?

• Existing Rocks are changed by pressure, heat, or
  chemical reactions
• They were once igneous or sedimentary

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Types of Metamorphic Rocks
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Extrusive rocks- igneous rocks formed from lava
(ex basalt)Intrusive rocks- igneous rocks
formed from magma (ex granite)
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Lava/magma that is low in silica forms dark
colored rocks. If it is high in silica, it
forms light colored rocks.
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Rocks from Coral Reefs

• Coral reefs are structures of calcite skeletons
  built up by coral animals in warm, shallow ocean
  water.
• When coral animals die, their skeletons remain
  and more corals build on top of them.

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The Rock Cycle

• Forces inside the Earth and at the surface
  produce a rock cycle that builds, destroys and
  changes the rocks in the crust
• Plate movements drive the rock cycle