Plate Tectonics

4. Astronomer who discovered continental drift theory
7. Outermost layer of the Earth
8. Layer beneath the mantle
11. The region where two tectonic plates come into contact
13. Type of plate boundary that the plates push against eachother
15. Area where molten rock rises to the Earths surface
17. Earth's thickest layer
18. Partly molten layer in the upper mantle
19. A sudden ground breaking release of built up energy under the Earths surface
20. Type of evidence that supported Wegener's theory involving types of animals that lived there

1. Earths centre, that has a radius of about 1200km
2. Opening in Earths surface that when active spews out gases chunks of rock and melted rock
3. Deep underwater valley formed when an oceanic plates subduct under a continental
5. Type of plate boundary that the plates push away from eachother
6. Plates that move and then re-join on the lithosphere
9. The big wave that is caused by the displacement of water after an earthquake
10. Type of plate boundary that the plates slide by eachother
12. formed by plate tectonics in the crust and upper mantle
14. Wegener's name for the "super continent"
16. Transform fault in California