Crust found under continents and continental shelves which is 25-90 k thick and rich in silica and aluminium.
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Crust.
The outmost layer of the Earth which can be either continental crust (25-90 km thick) or oceanic crust (5 to 10 km thick).
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Paleomagnetism.
'Historical magnetism' recorded in igneous rocks as iron-rich minerals become aligned with the Earth's magnetic field at the time they were formed.
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Collision boundary.
When two continental plates move towards each other neither can be destroyed in the mantle as continental crust is too buoyant, so they are pushed up to form fold mountains.
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Continental fit.
Evidence supporting the theory of plate tectonics: the coastlines of the Earth's major continents appear to fit together like a jigsaw.
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Conservative plate boundary.
Plates moving in opposite directions relative to one another build up pressure which is eventually released as an earthquake. No crust is created or destroyed.
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Convergent plate boundary.
When tectonic plates are moving towards each other (oceanic-oceanic crust or oceanic-continental crust)
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Crust.
Back
The outmost layer of the Earth which can be either continental crust (25-90 km thick) or oceanic crust (5 to 10 km thick).
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