Igneous, Metamorphic, Sedimentary

Rocks

Igneous Rocks

• Where do Igneous rocks come from?• Some of the first rocks• How are they classified?– Where they are from– Texture– Mineral Composition

Extrusive Rock

• Igneous rock formed by lava on the earth’s surface. (Basalt)

Intrusive Rock

• Igneous rock formed when magma beneath the earth’s surface hardens. (Granite)

Texture

• Extrusive=Rough or smooth• Intrusive=Rough or coarse (sandpaper)

Mineral Composition

• Different minerals give rock its color• Feldspar (pink)• Hornblende• Mica (light gray)• Quartz (smoky)

Sedimentary Rocks

• What is sediment?• How does it become rock?– Erosion-Depostition-Compaction-Cementation– THIS TAKES A LONG TIME!

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3 Main Types of Sedimentary

• Clastic– When pieces of rock squeeze together

3 Main Types of Sedimentary

• Organic – When dead plants and animals compact together

3 Main Types of Sedimentary

• Chemical– Minerals dissolve and crystalize

Metamorphic Rocks

• Sedimentary or Igneous rock that changes because of heat or pressure

• Classifying these rocks– Foliated– Nonfoliated