Plate Tectonics

4. The solid part of the earth consisting of the crust and outer mantle.
6. The boundary between two colliding plates, often associated with mountain building, ocean trenches and volcanic islands
7. A deep crack in the Earth's surface associated with divergent boundary.
9. The highest part of a chain of underwater mountains.
10. A surface feature in the seafloor produced by the descending plate during subduction.

1. Where two plates are moving apart, magma comes up to create new crust.
2. Proposed by Alfred Wegener, that the continents were once joined together and have since drifted apart.
3. Formed by two continental plates colliding and forcing each other upwards.
5. Circular currents in the mantle caused by the magma being heated by the core off the Earth.
8. The region where an oceanic plate sinks down into the asthenosphere at a convergent boundary, between continental and oceanic plates.