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IGNEOUS ROCKS

IGNEOUS ROCKS. Types of Igneous Rocks Igneous rocks fall into one of the two following categories Intrusive igneous rocks form underneath the Earth’s surface (magma) Extrusive igneous rocks form on the Earth’s surface (lava). Intrusive Igneous Rocks

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IGNEOUS ROCKS

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  1. IGNEOUS ROCKS

  2. Types of Igneous Rocks • Igneous rocks fall into one of the two following categories • Intrusive igneous rocks form underneath the Earth’s surface (magma) • Extrusive igneous rocks form on the Earth’s surface (lava)

  3. Intrusive Igneous Rocks • Take longer to cool down since they are inside the Earth and kept warm by surrounding rocks • This allows their crystals to grow larger

  4. Extrusive Igneous Rocks • Cool much faster since they are on the Earth’s surface • Have small crystals or are glassy • May also be vesicular (have air bubbles)

  5. Magma and Lava • Magma and lava are classified as felsic or mafic

  6. Felsic and Mafic Igneous Rocks • Felsic Rocks: Light-colored, less dense, contain silicon and aluminum, typically continental crust • Mafic Rocks: Dark-colored, more dense, contain iron and magnesium, typically oceanic crust

  7. What is an intrusion? -Any intrusion forms when magma cools inside earth’s interior after forcing its way through other rocks -Also known as a pluton -These rocks are composed of large- grained crystals due to their slow cooling rate

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