AQA GCSE Chemistry Unit 1 7.1 Earth

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  • Earth
    • Structure
      • Core- central ball of iron and nickel (3400km) 4000*C
      • Crust- thin layer of rock (5-70km)
      • Mantel- mostly solid but is still able to move slowly. (2900km thick)
      • Atmosphere- a layer of gases (100km)
      • Eathquakes, volcanoes and mountains
        • Heat released from the core due to radioactive decay creates convection currents in the mantel
          • Causes the plate/crust to move
            • (upper part of the mantel that has cracked into pieces)
            • Earthquakes: Plates run together
            • Mountains: Plates collide
            • Volcanoes: plates pull apart
        • Scientists cannot accuratley predict these because-: -they don't know what's happening under the crust-Earthquakes are random
    • Formation Theories
      • Wegner, Continental drift
        • Noticed...
          • Fossils of the same creatures on either side of the Atlantic
          • Continents fitted together like a jigsaw puzzle
        • Not accepted till after his death...
          • No explanation for how continents moved
          • Thought there were land bridges that the animals traveled over
      • Shrinking apple
        • As the earth cooled, the crust cooled and shrank and wrinkled, forming mountains. Earthquakes were from the movement of the crust sinking

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