Across
- 4. The rigid outer part of the earth, consisting of the crust and upper mantle.
- 6. What defines layers according to their physical properties.
- 9. Point within the earth where an earthquake rupture starts.
- 10. Denser, thinner, younger crust.
- 11. The ......... discontinuity is the boundary between the crust and the mantle.
- 13. Method used to locate the epicenter of an earthquake.
- 14. Created the first scientific map of the entire ocean floor.
- 16. Lower part of the mantle.
Down
- 1. Continuous flow that occurs in a fluid because of differences in density.
- 2. Upper part of the mantle.
- 3. Thicker and older crust.
- 5. The hypothetical landmass that existed when all continents were joined.
- 7. What defines layers according to their chemical properties.
- 8. Originator of the continental drift hypothesis.
- 12. The zone of earthquakes and volcanoes surrounding the Pacific Ocean.
- 15. Found evidence of sea-floor spreading.