Across
- 2. a basin-like depression because a volcano has exploded or the center of the volcano has collapsed
- 4. of fire, an area where many earthquakes and volcanoes occur
- 6. horizontal intrusions
- 7. chamber, large underground pool of molten rock
- 9. currents, what causes the plates to move
- 11. named after the Laurentian shield in Canada
- 13. waves, waves caused by earthquakes and rock movement
- 15. cone, lava that is built up in the shape of a cone
- 17. a fracture or zone or fractures between two blocks of rock
- 18. core, solid ball of nickel and iron densest layer of the earth
Down
- 1. circular basin or depression
- 2. rocks move together
- 3. vertical intrusion
- 5. first waves to reach the seismic station
- 8. named for the Gondwana region in India
- 10. zone, where one tectonic plate moves under another tectonic plate
- 12. Hess, proposed the plate tectonics theory
- 14. next waves to reach the seismic station
- 15. rocks slide past each other
- 16. Wegner, proposed the continental drift theory