Plate Tectonics Cris-cross!

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Across
  1. 2. the tool we use to measure seismic waves
  2. 3. the process where older seafloor sinks back into the mantle by way of a deep ocean trench
  3. 4. breaks in earths crust where rocks have slipped past eachother
  4. 6. a piece of the cracked shell of the crust and rests on the mantle while fitting snuggly with eachother
  5. 7. long chains of mountains that rise up from the ocean floor that add material to the seafloor from the mantle
  6. 9. the shaking and trembling that resuts from movement of the rock beneath Earth's surface
Down
  1. 1. deep underwater canyons that the sea-floor plunges into
  2. 3. a record of an earthquake's seismic waves produced by a seismograph
  3. 5. the most recent supercontinent
  4. 8. the outer layer of Earth