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Plate Tectonics What is it and what makes it work? Steven Earle, Geology Department Malaspina University-College
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The Earth’s interior 7000 C 4000 C 1000 C
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Pea-soup analogy
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mantle convection Heat transfer from the core to the mantle produces slow convection of the mantle material (in the order of centimetres per year)
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Mantle convection produces lateral forces at the boundary between the mantle and the crust
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Lateral forces at the crust- mantle boundary push the crust around – in different directions – and this leads to the motion of crustal plates. The plates are moving at rates of cm/year
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Plate motions
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Divergent boundary
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Convergent boundary Subduction
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Transform boundary
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Plates of the Earth’s crust
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Plates around North America
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