Across
- 2. plates split new land forms
- 4. the process that results when magma rises at a mid ocean ridge and pushes oceanic plates in two different directions away from the ridge
- 7. large hole formed by the collapse of a volcano's magma chamber.
- 10. An instrument that records vibrations in the ground.
- 12. plates slide past each other, forming faults and causing earthquakes
- 13. plates are pushed apart through mantle convection
- 15. In geology, a seismic wave that travels through the body of a medium.
- 17. Wave like ripples formed in rocks caused by compressional stress that raise the height of rock
- 19. The sudden return of elastically deformed rock to its undeformed shape.
- 21. The point on Earth's surface directly above an earthquake's starting point (or focus).
- 23. The rock that makes up Earth's crust is slightly less dense than the rock in the mantle, so it floats.
- 27. plates collide
- 30. an undersea mountain chain where new ocean floor is produced at a divergent plate boundary
- 31. A supercontinent containing all of Earth's land that existed about 225 million years ago
- 32. Zone An area of Earth's surface where no direct seismic waves form a particular earthquake can be detected.
- 34. A crack in the Earth's surface where slabs of crust slip past each other
- 37. the motion of the continents over time
- 39. a seismic water wave
- 40. a gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent.
- 41. magma when it reaches the surface
- 42. Gap An area along a fault where relatively few earthquakes have occurred recently but where strong earthquakes are known to have occurred in the past.
- 44. mountain that forms as continental crust crumples and bends into folds
- 45. a scientific theory describing the large scale motion of earths plates
- 46. Large ocean that used to surround Pangaea
- 48. S waves are the second-fastest seismic waves and arrive at detection sites right after the P waves come in.
- 49. process by which new crust forms at midocean ridges
- 50. The location within Earth along a fault at which the first motion of an earthquake occurs.
Down
- 1. the study of changes in Earth's magnetic field
- 3. a driving force that cause tectonic plates to move around
- 5. the process that results when a dense oceanic plate sinks beneath a more buoyant plate along a subduction zone , pulling the rest of the plate that trails behind it
- 6. changes in shape or size of rock body cause by stress.
- 8. fragments of rock that form during a volcanic eruption
- 9. A tracing of an earthquake motion that is recorded by a seismograph.
- 11. A measure of the strength of an earthquake.
- 14. long line of mountains that were formed at about same time and by same processes
- 16. spot an area where
- 18. formed when magma pushes up on layers of rocks
- 20. P waves are seismic waves that cause particles of rock to move in a back-and-forth direction that is parallel to the direction in which the waves are traveling.
- 22. the shaking and trembling that results from the movement of rock beneath Earth's surface
- 24. In geology, a seismic wave that travels along the surface of a medium and that has a stronger effect near the surface of the medium than it has in the interior.
- 25. wave The energy released by the earthquake travels in all directions from the focus.
- 26. Deformation resulting from stress
- 28. a molten mixture of rock forming substances,gases, and water from the mantle
- 29. Zone A region of numerous, closely spaced faults.
- 32. the process that occurs when one tectonic plate moves under another tectonic plate
- 33. the process by which supercontinentsform and break apart over time
- 35. form as blocks of rock move up or down along normal fault
- 36. any activity that includes the movement of magma toward or onto earth's surface.
- 38. a slice of lithosphere that has been added to the margin of a continent during plate collision.
- 43. a mountain that forms in earths crust when molten material, or magma, reaches the surface
- 47. a force that acts on rock to change its shape or volume.