Across
- 2. the outer core is about ______ long
- 5. there are ____ layers of the earth
- 7. earthquakes mostly occur on plate __________
- 10. steel and ______ support help keep buildings standing
- 11. suggested sea floor spreading
- 15. a crack in the earth where lava flows out
- 17. suggested continental drift
- 19. are huge, fast,and strong waves
- 21. directly above the focus; on the earth's surface
- 23. is the layer below the lithosphere
- 25. the ________ plate covers Asia
- 26. volcanoes are formed in __________ zones
- 27. tsunamis can tech a height of ______ meters
- 29. it takes at least _____ stations to locate an epicenter
- 31. the Juan De Fuca plate is near __________
- 34. waves are the fastest
- 36. primary waves travel _____ as fast as secondary waves
- 37. a _______ is a collapsed crater
- 38. waves are the second to fastest
- 39. cone volcanoes that have steep sides
- 40. super continent
Down
- 1. volcanoes can erupt quietly or violently
- 3. the _____ plate to the west of the South American plate
- 4. part of a seismograph that doesn't move in an earthquake
- 6. boundaries where plates collide
- 8. waves do the most damage to buildings
- 9. volcanoes that have broad, gently sloping sides
- 12. makes up tectonic plates
- 13. a seismograph produces a __________
- 14. boundaries where plates pull apart
- 16. the Antarctic plate is on the _____ side of the world
- 18. this turns the ground to muck; buildings sink into it
- 20. helped map the sea floor
- 22. used to measure the strength of an earthquake
- 24. boundaries where plates move side by side
- 28. the _____ core is solid
- 30. where two continental plates collide
- 32. valleys are formed when plates pull apart
- 33. are breaks in the crust that spew magma, ashes, and gases
- 35. the _____ is a layer of magma near the crust