Plate tectonics key terms 3.5 / 5 based on 4 ratings ? GeographyPlate tectonicsASAll boards Created by: Hannah-mayCreated on: 28-02-13 12:20 Lithosphere The crust of the Earth around 80-90 km thick 1 of 7 Asthenosphere A semi-molten zone of rock underlying the Earth's crust 2 of 7 Plates Rigid,less dense 'slabs' of rock floating on the asthenosphere 3 of 7 magma molten material which rises from the Earth's surface when hotspots within the asthenosphere generate convection currents 4 of 7 constructive boundary a boundary between plates where the plates are diverging or moving apart 5 of 7 destructive boundary a boundary between plates where the plates are converging 6 of 7 conservative boundary a boundary between plates where the movement of the plates is parallel to the plate margin and the plates slide past each other 7 of 7
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