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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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    Igneous rock Igneous rock Presentation Transcript

    • The Earth’s Crust Rock Families Igneous Rock
    • Rock Families
      • #3 Metamorphic
        • #1 Igneous
      • There are three rock families:
        • #2 Sedimentary
    • 1. Igneous Rock
      • Igneous Rock - “Born of Fire”
      • Igneous rock forms from melted rock (lava or magma) when it cools.
    • Lava – melted rock that is found outside (“on”) the Earth’s crust
    • Magma – melted rock that is found inside the Earth’s crust
    • 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
      • 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)
      • 2. Extrusive rock – igneous rock that is formed from cooled lava (e.g. pumice)
      • The main difference between intrusive and extrusive rock is their crystal size, which depends on how quickly they cool.
    • 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
      • Examples of Igneous Rock:
      • Granite
      • Pumice
      • Obsidian
      • Basalt