Plate Tectonics

3. spreading A process that occurs at mid-ocean ridges where new crust is formed by volcanic activity
6. A huge wave in the ocean caused by an earthquake occurring on the sea floor
8. Earthquakes are measured with this instrument
9. Plates that move away from each other
10. Supercontinent with all the continents joined together and structured 600 to 530 million years ago
13. Crust that ‘carries’ the ocean and tends to subduct
15. Plates that slide past each other
16. Transform boundaries can cause _______
18. What time period did the supercontinent break up
19. push Process where new ocean crust forms at the ridges above the rest of the crust and so gravity pulls the new crust downwards

1. One of the main evidence to continental drift was that the continents fit together like a _____ -
2. Crust that ‘carries’ the continents and do not subduct
4. Plates that move towards each other
5. Wegener Person that proposed the idea of continental drift
7. spot Isolated place away from plate boundaries where a lot of hot magma is collecting
11. The sea that surrounded Pangaea
12. Name for the crust and the upper mantle together; Earth’s tectonic plates.
14. We live on the Earth’s outer layer
17. waves The waves in Earth are called ______
18. Supercontinent that existed millions of years ago