Across
- 4. The very slow creeping motion of earth's solid silicate mantle caused by convection currents carrying heat from the interior to the
- 6. Geologist who proposed the theory of sea-floor spreading.
- 7. It is formed when a continental plate and an ocean plate collides.
- 8. Is the instrument used to mapped the mid-ocean ridges.
- 10. The point within the earth where the actual movement takes
- 11. A concentration of heat in the mantle capable of creating magma
- 14. Deepest part of earth.
- 15. An upwelling of superheated rock from the mantle.
- 16. Thickest layer of the earth where magma comes from.
- 17. Surface seismic wave that cause horizontal shifting of the earth during an earthquake.
- 18. This may happen during divergence or convergence of plates because of the movement of plates.
- 19. Formed when two oceanic crusts collide.
- 23. Theory that states that the earth's crust is divided into several plates.
- 24. A very large wave that is caused by earthquake.
- 26. One of the possible cause of plate movements which the ridge pushes the old sea-floor towards the trench and it will subduct.
- 27. Upper mantle.
- 28. Proposed to be the supercontinent 250 million years ago.
- 31. A recording device that is used to locate the earthquake's epicenter.
- 36. Method that is used to locate the epicenter of an earthquake.
- 39. Process which happens when ocean plates move apart and magma rises from the mantle and create new areas of oceanic crust.
- 40. Theory that states that there was a big continent before.
Down
- 1. Seismic wave that travels across the surface of the earth as opposed through it.
- 2. Surface seismic wave generated by the interaction of p-waves and s-waves at the surface of the earth that move with a rolling motion.
- 3. Top layer of earth.
- 5. Outer crust.
- 9. Geologic feature that happens when two continental plates move apart from each other.
- 12. Type of plate boundary that collides with each other.
- 13. Wave of energy that travels through the earth as a result of an earthquake.
- 18. The point on the surface directly above the focus.
- 20. Other possible cause of plate movements which the weight of the subducting plate pulls the trailing slab into the subduction zone just like a tablecloth slipping off the table and pulling items with it.
- 21. Seismic wave that travels through the earth rather than across its surface.
- 22. surface.
- 25. Geologic feature that happens when two continental plates collide.
- 29. Hot molten material that rises from the mantle to the crust.
- 30. Type of plate boundary that are sliding past each other.
- 32. This process happens when the oceanic crust sinks beneath the continental crust.
- 33. Type of plate boundary that plates are moving away from each other.
- 34. A geologic feature that may form when plates are moving away from each other.
- 35. The one who made the continental drift theory.
- 37. Boundary between the crust and mantle, as inferred from the change in the speed of body waves
- 38. Time difference between the p-waves and s-waves.