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Igneous rocks

Igneous rocks. Video Quiz True or False?. 5. Igneous Rocks. Section 5.1: What are igneous rocks? Section 5.2: Classification of Igneous Rocks. Section 5.1. Objectives. What are igneous rocks?. Summarize igneous rock formation. Describe the composition of magma.

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Igneous rocks

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  1. Igneous rocks

  2. Video Quiz True or False?

  3. 5 Igneous Rocks Section 5.1: What are igneous rocks? Section 5.2: Classification of Igneous Rocks

  4. Section 5.1 Objectives What are igneous rocks? Summarize igneous rock formation. Describe the composition of magma. Igneous rocks are the rocks that form when molten material cools and crystallizes.

  5. Igneous Rock Formation What are igneous rocks? Lava is magma that flows out onto Earth’s surface. Igneous rocks form when lava or magma cools and minerals crystallize.

  6. What are igneous rocks? Igneous Rock Formation Magma formation Magma can be formed either by melting of Earth’s crust or by melting within the mantle.

  7. Draw and Label a volcano, lava, and magma. (in your workbook)

  8. What are igneous rocks? Igneous Rock Formation Magma formation The four main factors involved in the formation of magma are temperature, pressure, water content, and mineral content.

  9. What are igneous rocks? Magma formation Temperature generally increases with depth in Earth’s crust. This temperature increase is known as the geothermal gradient. How deep in Earth do you have to go to reach 1000°C? How hot is it at 3000km?

  10. 1. What is lava? 2. What is magma? Flash cards

  11. Classification of Igneous Rocks Objectives Classify different types and textures of igneous rocks. Recognize the effects of cooling rates on the grain sizes in igneous rocks.

  12. Section 5.2 Classification of Igneous Rocks Classification of igneous rocks is based on mineral composition, crystal size, and texture.

  13. Where Igneous Rocks Form Classification of Igneous Rocks When magma cools and crystallizes below Earth’s surface, intrusive rocks form. Magma that cools and crystallizes on Earth’s surface forms extrusive rocks.

  14. Texture Classification of Igneous Rocks Texture refers to the size, shape, and distribution of the crystals or grains that make up a rock. We use texture to tell us if a rock was intrusive or extrusive.

  15. Texture Section 5.2 Classification of Igneous Rocks Crystal size and cooling rates Extrusive Rocks: • When lava flows on Earth’s surface, it cools QUICKLY. • Crystals are MICROSCOPIC

  16. Classification of Igneous Rocks Texture Crystal size and cooling rates Intrusive Rocks: • When magma cools slowly below Earth’s surface • Large crystals to form.

  17. Classification of Igneous Rocks Texture Porphyritic texture • large, well-formed crystals • surrounded by finer-grained crystals of the same mineral or different minerals.

  18. Classification of Igneous Rocks Texture Vesicular texture • spongy appearance • results of gas bubbles trapped in lava

  19. Give 2 examples of intrusive igneous rocks. What is the grain size of an intrusive rock? Give 2 examples of extrusive igneous rocks. What is the grain size of an extrusive rock? How are intrusive igneous rocks formed? How are extrusive igneous rocks formed? Flash cards

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