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Earth's structure and plate tectonic theory

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What is the Earth's crust majorly made of?

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Explanation

Basalt is the oceanic crust (dense) and granite is the continental crust (less dense)

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How does seafloor spreading occur?

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Explanation

Magma cools to create new rock. Older rock is found further away from the spreading zone

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Palaeomagnetism is associated with ...

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How often does the Earth's magnetic field flip?

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Explanation

Results in a series of magnetic stripes as seafloor rocks align alternatively towards north and south poles

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How does palaeomagnetism associate with plate movement?

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What is the name of the man who developed the theory of continental drift?

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How long ago did he believe the continents were once joined together?

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How many types of evidence for continental drift are there?

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Explanation

Same types of fossils; shape of the coasts; matching rock formations

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Where was Alfred Wegener's "study countries" for his evidence for continental drift?

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