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Plate Tectonics JC

Plate Tectonics for Junior Certificate students

TermDefinition
Crust The Earth's outer skin, made of solid rock between 10km and 60km thick.
Mantle A layer of hot, soft rock in a molten of semi-molten state with temperatures of about 4000c.
Core Found at the centre of the Earth and made of nickel and iron, this is the hottest layer of the Earth, at over 5000c
Magma The molten or semi-molten material that makes up the Earth's mantle.
Plates The sections that the Earth's crust is broken into.
Plate tectonics The theory that attempts to explain the movement of plates and the features that result.
Convection currents The movement of magma in a circular motion as it is heated by the core.
Transform boundary Plates that slide past each other , neither creating or destroying crust.
Destructive boundary Where plates collide causing crust to be destroyed as the heavier plate is forced down in to the mantle where it melts.
Constructive boundary Where plates separate causing new crust to be created as magma rises to the surface cools and solidifies.
Continental drift The process by which the plates drift on the mantle carrying the continents with them,
Pangaea The singular large landmass when all the continental plates were connected.
Created by: Ms O Sullivan
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