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Asthenosphere - The partial liquid layer - part of the mantle, Crust - The outermost 'skin of the earth that varies in thickness between 12 and 120km, Stratovolcano - Otherwise know as a composite volcano, Tephra - Can vary from fine ash to volcanic bombs over 64mm in size, Benioff Zone - The zone of melting at a destructive margin, ring of fire - The name of the spatial pattern of volcanoes marking the plate margins around the pacific, Igneous rocks - Rocks formed by the cooling of molten magma, Plumes - Rising currents of heat (part of convection cells) usually associated with rising magma, Ocean Trenches - Deep gashes in the sea floor up to 10971m deep marking destructive plate margins,

A2 Geography Tectonics Keyterms


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