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