earth and rocks

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  • EARTH & ROCKS
    • igneous rocks
      • examples
        • granite
        • basalt
      • Pressure can force magma out of the ground. This creates a volcano. When the magma cools it turns into solid rock, called extrusive igneous rock
      • Magma that cools underground forms solid rock called intrusive igneous rock
    • sedimentary rocks
      • examples
        • limestone
        • chalk
        • sandstone
      • Compaction and cementation presses the layers and sticks the particles together
    • Metamorphic rocks
      • examples
        • slate
        • marble
      • Rocks underground that get heated and put under pressure are changed into metamorphic rock
    • weathering
      • Definition:  wearing away the rocks
      • slow flowing rivers transoprt small rocks eroding them  on the way
      • fast flowing rivers can trasport large rock eroding them on the way
      • waves erode cliffs and cause the cliffs to crumble and break
      • biological weathering is when animal burrow between cracks in the rock and cause other rocks to fall
        • biological weathering
      • physical weathering
        • Physical weathering is caused by physical changes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves
      • biological weathering
      • chemical weathering
        • Rainwater is naturally slightly acidic. Minerals in rocks may react with the rainwater, causing the rock to be weathered
          • weathering
            • Definition:  wearing away the rocks
            • slow flowing rivers transoprt small rocks eroding them  on the way
            • fast flowing rivers can trasport large rock eroding them on the way
            • waves erode cliffs and cause the cliffs to crumble and break
            • biological weathering is when animal burrow between cracks in the rock and cause other rocks to fall
              • physical weathering
                • Physical weathering is caused by physical changes such as changes in temperature, freezing and thawing, and the effects of wind, rain and waves
              • chemical weathering
                • Rainwater is naturally slightly acidic. Minerals in rocks may react with the rainwater, causing the rock to be weathered

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