C2a - Structure of the Earth

Across

• 1. The Earth's crust is split into ________ plates. The plates move very slowly as a result of convection currents in the non-rigid mantle. (8)
• 4. ______ rock UNDER the ground is called magma. ______ rock on the Earth's SURFACE is called lava. (6)
• 5. Oceanic plates are more _____ than continental plates and plates cooler at ocean margins so sink and pull plates down. (5)
• 6. Thermal energy from the Earth's core causes __________ currents in the mantle - kinetic energy transferred to tectonic plates. (10)
• 7. This type of rock is formed by the cooling of molten rock. (7)
• 8. This is between the crust and the core. It is cold and rigid just below the crust, at greater depths hot and non-rigid so able to move. (6)
• 10. If molten rock cools ______, LARGE crystals are formed, e.g. granite. (6)