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