Plate Motions: Listening to Earth

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Across
  1. 3. a measure of how often or fast something happens
  2. 5. formed by one plate sinking under another
  3. 9. any of the many processes in which gas, lava, and ash is pushed out on the surface of Earth
  4. 13. the place where two plates meet
  5. 14. powerful microphones that are built to travel deep underwater
  6. 15. the layer of soft, solid rock underneath Earth's plates
  7. 16. moving apart in different directions
  8. 17. a diagram that shows what the inside of something looks like
  9. 18. something we observe to be similar over and over again
  10. 20. moving toward the same place
Down
  1. 1. places where two plates are moving away from each other
  2. 2. small earthquakes that occur before big earthquakes
  3. 4. one of the very large sections of hard, solid rock that make up Earth's outer layer
  4. 6. the sudden pushing out of things, such as lava from a volcano
  5. 7. a scientist who studies sound in the ocean
  6. 8. a sudden shaking of the Earth's surface
  7. 10. Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water
  8. 11. an underwater mountain range formed when two plates move apart
  9. 12. an underwater canyon that is part of the Mariana trench
  10. 19. a long, deep indentation in the ocean floor formed when two plates move together
  11. 21. National Oceanic and Atmospheric Administration