Earth Science 3 2

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Earth Science 3 2

  1. 1. Igneous Rocks 3.2<br />
  2. 2. Intrusive Igneous Rock<br />Igneous rocks that form below Earth’s surface.<br />
  3. 3. Extrusive Igneous Rock<br />Igneous rock that has formed on Earth’s surface.<br />
  4. 4. Porphyritic Texture <br />An igneous texture consisting of large crystals embedded in a matrix of much smaller crystals.<br />
  5. 5. Granitic Composition <br />A compositional group of igneous rocks that indicate a rock is composed almost entirely of light-colored silicates, mainly quartz and feldspar.<br />
  6. 6. Basaltic Composition <br />A compositional group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calcium rich plagioclase feldspar.<br />
  7. 7. Andesitic Composition<br />The composition of igneous rocks lying between felsic and mafic.<br />
  8. 8. Ultramafic<br />Igneous rock composed mainly of iron and magnesium-rich minerals.<br />
  9. 9. Key Concept <br />How are intrusive and extrusive igneous rocks alike and different?<br />Extrusive rocks are formed when lava hardens and Intrusive rocks are formed when magma hardens beneath Earth’s surface.<br />
  10. 10. Key Concept<br />How does the rate of cooling affect an igneous rock’s texture?<br />Slow cooling results in the formation of large crystals and rapid cooling of magma or lava results in rocks with small, interconnected mineral grains.<br />
  11. 11. Key Concept<br />How are igneous rocks classified according to composition?<br />They are classified by both texture and composition. <br />

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