Geology Crossword

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Across
  1. 3. These waves move slower than P-waves and can only move through solid rock.
  2. 4. The Alaskan earthquake started when the Pacific plate which is dense, pushed under the less dense North American plate.
  3. 5. In 1864, the seismic waves set out by the lithosphere caused the earth to vibrate and transferred energy throughout the earth's crust.
  4. 8. The time interval between the two waves can also be used with other values to determine what?
  5. 9. These waves travel the fastest. When these waves travel through the rock, the matter is alternately compressed and then expanded.
  6. 10. During the Alaskan earthquake of 1864, the seismic waves originated from the initial breaking point along the fault is called?
  7. 13. Caused by the accumalation of snow and moved by gravity.
  8. 14. Covers all of Antartica and Greenland. Ice builds up at the center, reaching dephs of over 2 km and flows out towards the sea.
  9. 17. These glaciers reached a critical mass and began to form in the mountains and stretched into the valleys below
Down
  1. 1. Waves P-waves where the motion of the particles is parallel to the direction it is traveling in.
  2. 2. Waves S-waves where the motion of the particles is perpendicular to the direction it is travelling in.
  3. 3. Determines the motion of the ground. During the Alaskan earthquake it nearly went off the paper.
  4. 5. The last glaciation, over 18,000 the ice advanced to its maximum, it covered all the are from the North Pole to Wisconsin alon with Greenland and parts of Russia.
  5. 6. In some cases this wasn't always on top of the focus, during the Alaskan earthquake, Prince William Sound was the place directly above the focus and it was 120 km east.
  6. 7. Since P-waves transfer less energy. S-waves have a higher ____________ than P-waves.
  7. 11. The boundary between the Pacific plate and the North American Plate.
  8. 12. Period when polar ice sheets advanced to cover large regions of North America and Northern Europe.
  9. 15. Set off by a earthquake
  10. 16. This term is used to define the period when ice sheets cover parts of the Northern and Southern hemisphere.