Across
- 2. layer of earth.
- 5. Method-method that is used to locate the epicenter of an earthquake.
- 6. mantle.
- 7. floor spreading-proccess which happens when ocean plates move apart and magma rises from the mantle and create new areas of oceanic crust.
- 14. waves-A seismic wave that travels through the Earth rather than across
- 15. the instrument used to mapped the mid-ocean ridges
- 18. time-time difference between the P-waves and S-waves.
- 19. type of plate boundary that are sliding past each other.
- 22. layer of the earth where magma comes from.
- 23. molten material that rises from the mantle to the crust.
- 25. Convection- the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the
- 28. boundary between the crust and mantle, as inferred from
- 29. change in the speed of body waves
- 30. to through it.
- 32. very large wave that is caused by earthquake.
- 33. point within the Earth where the actual movement takes
- 34. geologist who proposed the theory of sea-floor spreading.
- 37. surface
- 38. Plumes-an upwelling of superheated rock from the mantle.
- 39. tectonics theory-a theory that states that the Earth's crust is divided into several plates.
- 40. theory.
- 41. Waves-A seismic wave that travels across the surface of the Earth as
- 45. crust.
- 46. one who made the continental
- 47. arc-formed when two oceanic crusts collide.
- 48. type of plate boundary that plates are moving away from each other.
Down
- 1. an earthquake.
- 3. surface.
- 4. earthquake.
- 8. point on the surface directly above the focus.
- 9. process happens when the oceanic crust sinks beneath the continental crust.
- 10. and S-waves at the surface of the Earth that move with a rolling motion.
- 11. Drift Theory-a theory that states that there was a big continent before.
- 12. recording device that is used to locate the earthqiake's epicenter.
- 13. to be the supercontinent 250 million years ago.
- 16. type of plate boundary that collides with each other.
- 17. geologic feature that may form when plates are moving away from each other.
- 20. Pull-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. waves-A surface seismic wave generated by the interaction of P-
- 24. Spot-a concentration of heat in the mantle capable of creating magma
- 26. is formed when a continental plate and an ocean plate collides.
- 27. ranges-a geologic feature that happens when two continental plates collide.
- 31. waves-A wave of energy that travels through the Earth as a result of
- 35. may happen during divergence or convergence of plates because of the movement of plates.
- 36. Push-one of the possible cause of plate movements which the ridge pushes the old sea-floor towards the trench and it will subduct.
- 42. valley-a geologic feature that happens when two continental plates move apart from each other.
- 43. part of earth.
- 44. waves-A surface seismic wave that cause horizontal shifting of the Earth