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!
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