Astronomy crossword

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Across
  1. 4. What is it called when light bends
  2. 5. A rock that is solidified lava.
  3. 11. The visible difference of different layers.
  4. 13. The process that causes volcanoes.
  5. 15. An instrument that records earthquakes.
  6. 16. The process that moves tectonic plates.
  7. 18. The theory of explaining Earth’s crust.
Down
  1. 1. Two regions that surround Earth at several thousand feet.
  2. 2. A rock that is formed by sediment.
  3. 3. A region that surrounds earth with a magnetic field.
  4. 6. A very hard igneous rock.
  5. 7. Outer most layer on the earth.
  6. 8. An elastic wave that is produced by an earthquake.
  7. 9. The science that deals with Earth’s structure.
  8. 10. A volcanic rock.
  9. 12. Where a tectonic plate sinks into the mantle.
  10. 14. A region with that makes island chains to form.
  11. 17. The process that causes earthquakes.