Across
- 1. Spreading, The process that occurs at mid-ocean ridges
- 4. the upper layers of the Earth's mantle
- 6. Strength, The ability to withstand the stress of physical forces
- 8. Boundary, when two plates come together
- 10. the degree of compactness of a substance
- 14. A scientist who studies the physical aspects of the Earth
- 15. ridge, a continuous range of undersea volcanic mountains
- 17. Zone, when tectonic plates meet at a convergent boundary
- 18. Crust, the relatively thin part of the Earth's crust which underlies the ocean basins
- 19. Rapture in the Earth's crust that allows hot lava to escape from the Earth's mantle
Down
- 2. The results of sudden movement along faults within the earth
- 3. Mantle, Very thick layers of rock inside the Earth
- 5. Of Fire, The region around much of the rim of the Pacific Ocean
- 7. Boundary, when two plates move away from each other
- 8. the lightest rock layer
- 9. Boundary, when plates slide sideways past each other
- 11. zone, the place where two lithospheric plates come together
- 12. Plumes, A Proposed mechanism of convection within the Earth's mantle
- 13. Thrust sheets of ancient oceanic crust and upper part of the mantle
- 16. Wegner, The scientist who discovered Continental Drift