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Plate Tectonics

Beschreibung

Restless earth at Year 9 level
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Zusammenfassung der Ressource

Plate Tectonics
  1. Volcanoes
    1. Composite
      1. Infrequent Erruptions but violent
        1. Thick, sticky Larva
        2. Shield
          1. Frequent Erruptions
            1. Thin Runny Larva
          2. Inside the earth
            1. In the mantle there is a convection current where the hot air rises and sinks when it cools
              1. The crust is split into 14 major plates and 38 minor plates
                1. Key Terms
                  1. Crust
                    1. Outer layer of the earth
                    2. Plate
                      1. A section of the earth's crust
                      2. Plate Margin
                        1. The boundary where 2 plates meet
                        2. Mantle
                          1. The dense layer
                            1. Semi-liquid layer
                            2. Convection currents
                              1. The process of air rising and sinking
                          2. Crust
                            1. Oceanic Crust
                              1. Newer- generally less than 200 million years old
                                1. Can possibly sink
                                  1. Denser
                                    1. Can be renewed and destroyed
                                    2. Continental Crust
                                      1. Can't sink
                                        1. Older - More than 1500 million years old
                                          1. Less dense
                                            1. Cannot be destroyed or renewed
                                          2. Plate Margins
                                            1. Destructive Plate Margins
                                              1. Where the plates move towards each other and collide
                                                1. The most destructive is when a continental plate collides with a oceanic plate, the oceanic plate sinks bellow the continental. (subduction Zone)
                                                2. Constructive
                                                  1. Where the plates move apart or diverge
                                                    1. A volcano is formed in the gap
                                                    2. COnservative Boundaries
                                                      1. Plates moving across each other
                                                        1. The plates are moving at different speeds in different directions

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