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Igneous rocks

Igneous rocks. 7 th Grade Science. Igneous rocks. Igneous rocks are classified according to their texture, origin and composition. Igneous rocks. Orgin Igneous rocks may form on or beneath earths surface. Igneous rocks.

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Igneous rocks

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  1. Igneous rocks 7th Grade Science

  2. Igneous rocks • Igneous rocks are classified according to their texture, origin and composition

  3. Igneous rocks • Orgin • Igneous rocks may form on or beneath earths surface

  4. Igneous rocks • Extrusive rock  formed from lava that erupted onto earths surface most common is basalt which is much of the ocean floor • Fast cooling and smaller crystals • Obsidian--no crystals • Basalt--micro crystals

  5. Igneous rocks • Intrusive Rock Igneous rock that formed when magma hardened below the earths surface (Granite) • Slow cooling and larger crystals • Granite

  6. Igneous rocks • Mineral Composition • Most of earth’s minerals contain silica made out of oxygen an silicon • The amount silica affects the type of igneous rock formed

  7. Igneous rocks • Uses • Building Materials • Statues (granite) • Bridges • Gravel (basalt) • Abrasives (pumice) • Tools (obsidian)

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