mantle - the layer of molten rock located located beneath the Earth's crust, inner core - A dense sphere of solid iron and nickel at the centre of Earth, outer core - A layer of molten iron and nickel that surrounds the inner core of Earth, Crust - The layer of rock that forms Earth's outer surface, also known as the lithosphere, Asthenosphere - the middle layer of the mantle comprised of partially molten rock; tectonic plates lay on top of the asthenosphere, Continental drift - continents are in constant motion on the surface of the Earth, Subduction - the movement of one tectonic plate under another tectonic plate, Oceanic crust - the part of the Earth's crust that lies below the oceans. Much thinner and denser than continental crust, continental crust - forms the continents and landmasses on the surface of the Earth. Much thicker than oceanic crust, but less dense, Tectonic plate - A large layer of solid rock that covers part of the surface of Earth. Movement of tectonic plates can cause earthquakes, plate tectonics - the theory stating that the surface of Earth is divided into a series of plates that are continually moving, Convergent boundary - the boundary between two tectonic plates that are moving together, Divergent boundary - the boundary between two tectonic plates that are moving apart, Transform boundary - the boundary between two tectonic plates that are sliding past each other, sea-floor spreading - a theory that the middle of the ocean is spreading apart forming new oceanic crust,

(Year 9) Plate Tectonics Glossary

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