Geography 0.0 / 5 ? GeographyRestless EarthGCSEAQA Created by: Katie_Created on: 16-02-14 15:39 Oceanice Crust Under the ocean is oceanic crust. This is much thinner, usually 6-8km thick. It is denser and made of an igneous rock called basalt. 1 of 15 Continental Crust Forms the land. Mostly made up of granite. It is on average 30-50km thick. 2 of 15 Mantle The astherosphere is in the top layer of the mantle. It is mostly solid rock. 3 of 15 Core The outer core is liquid, it is also dense and metallic. The inner core is a solid, it contains radioactive material and generates heat. 4 of 15 Lithosphere The uppermost layer of the Earth. It is cool and brittle. 5 of 15 Asthenosphere In the top layer of the mantle. The tectonic plates move very slowly on this layer. 6 of 15 Convection currents Bring magma up from the mantle. 7 of 15 Magnetosphere Earth is surrounded by a huge invisible magnetic field. This is a force field. It protects the Earth from harmful radiation from space and the sun. 8 of 15 Conservative plate boundary Formed when two plates slide past each other. 9 of 15 Constructive plate boundary Formed when two plates move apart. 10 of 15 Destructive plate boundary Formed when two plates collide and oceanic crust is sub ducted under continental crust. 11 of 15 Collision plate boundary When two continental plates meet and fold up to create mountains. 12 of 15 Focus The point in the crust where the Earthquake originates. 13 of 15 Epicentre Point directly above focus on the surface of the crust. 14 of 15 Seismic waves The waves of energy released by the plates which form the earthquake. 15 of 15
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