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Igneous rock

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This was created to meet the curriculum outcomes in New Brunswick's Grade 7 Science Earth's Crust Unit.

This was created to meet the curriculum outcomes in New Brunswick's Grade 7 Science Earth's Crust Unit.

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  • 1. The Earth’s Crust Rock Families Igneous Rock
  • 2. Rock Families
    • #3 Metamorphic
      • #1 Igneous
    • There are three rock families:
      • #2 Sedimentary
  • 3. 1. Igneous Rock
    • Igneous Rock - “Born of Fire”
    • Igneous rock forms from melted rock (lava or magma) when it cools.
  • 4. Lava – melted rock that is found outside (“on”) the Earth’s crust
  • 5. Magma – melted rock that is found inside the Earth’s crust
  • 6. Magma – melted rock that is found inside the Earth’s crust Lava – melted rock that is found outside (“on”) the Earth’s crust Lava sampling
  • 7.
    • When lava and magma cool, they form two different kinds of Igneous rock:
    • 1. Intrusive rock – igneous rock that is formed from cooled magma (e.g. granite)
  • 8.
    • 2. Extrusive rock – igneous rock that is formed from cooled lava (e.g. pumice)
  • 9.
    • The main difference between intrusive and extrusive rock is their crystal size, which depends on how quickly they cool.
  • 10. Intrusive rock (from magma) cools very slowly inside the Earth’s crust and forms large crystals. Extrusive rock (from lava) cools quickly and forms small crystals.. Igneous rock video
  • 11.
    • Examples of Igneous Rock:
    • Granite
    • Pumice
    • Obsidian
    • Basalt