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Es4

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  • 1. Igneous Rocks<br />(with slides from “ms simmons”)<br />
  • 2. Magma forms igneous rocks<br />
  • 3. What is magma? <br />Hot molten (melted) rocks<br />When magma cools inside the earth, it forms igneous rocks<br />When magma (lava)cools outside the earth, it forms igneous rocks<br />
  • 4. Magma and lava<br />
  • 5. Molten rocks<br />Inside the earth = magma<br />Outside the earth = lava<br />How does magma escape to the outside? (Magma escapes to the outside through ______)<br />
  • 6. Volcano<br />
  • 7. Intrusive rocks<br />Formed when magma cools INSIDE the earth.<br />
  • 8. Extrusive rocks<br />Formed when magma (as lava) cools OUTSIDE the earth.<br />In-<br />Ex-<br />
  • 9. Cooling<br />Intrusive vs. Extrusive rocks: which will cool faster?<br />
  • 10. Extrusive Rocks<br />Formed at earth’s surface<br />Lava’s minerals cool and harden quickly<br />Forms tiny crystals<br />Rhyolite <br />Obsidian<br />Andesite<br />Basalt<br />
  • 11. Intrusive Rocks<br /><ul><li>Formed below earth’s surface
  • 12. Magma’s minerals cool and harden slowly
  • 13. Forms coarse crystals</li></ul>Diorite<br />Gabbro<br />Granite<br />
  • 14. Quiz<br />As the head geologist of an expedition, you come across an unknown mineral.<br />1. How do you convince your colleagues that it’s indeed a mineral? (hint: how do you define a mineral?) Name 5 defining criteria of the mineral that make it a mineral. <br />a. minerals are solid<br />2. Name 3 properties of the mineral that you’d test to identify the mineral.<br />
  • 15. Quiz<br />What is magma? i.e. what is it made of?<br />What is lava? i.e. how is it different from magma?<br />Which type of rocks does lava form when it cools?<br />Which type of rocks does magma form when it cools?<br />Define a mineral. (name 5 criteria)<br />a. minerals are solid<br />

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