Igneous, Metamorphic, Sedimentary Rocks. Igneous Rocks Where do Igneous rocks come from? Some of the first rocks How are they classified? – Where they.

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Presentation transcript:

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

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