Circular currents of heat in the Mantle Crust The outer layer of the Earth Relatively thin – up to 70km thick Oceanic or Continental Split into plates Likely to move at Plate Boundaries Mantle Layer beneath the crust Dense, semi molten state – silicate rocks Plates float on the mantle Up to 5000°c, which creates powerful convection currents Convection Currents Circular currents of heat in the Mantle Caused by the rising heat within the mantle Direction of currents drives, and determines direction of plate movements Core Divided into 2 sections – inner and outer Up to 6200°c Extreme pressure Iron and nickel Outer core semi molten Inner core dense and solid

Most likely to be…which part of Earth structure: 1. Find yourself being carried round and round, very slowly 2. Under the most intense pressure 3. Surrounded by either basalt or granite 4. In a half solid/half liquid state 5. In the thinnest section 6. Always moving 7. Feel trapped underneath a very hard roof