Rocks

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Rocks
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Types of Rocks
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Sedimentary RocksHow They are Made

• Wind and water break down the earth
• Bits of earth settle in lakes and rivers
• Layers are formed and build up
• Pressure and time turn the layers to rock

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Types of Sedimentary Rocks
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Metamorphic RocksWhat are They?

• Rocks that have changed
• They were once igneous or sedimentary
• Pressure and heat changed the rocks

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Types of Metamorphic Rocks
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Igneous RocksWhat are They?

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

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Types of Igneous Rocks
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Rocks from Coral Reefs

• 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