Noor's crossword

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Across
  1. 4. no longer in existence
  2. 5. a volcano that is erupting
  3. 6. outer layer of the Earth
  4. 7. the plates sliding sideways past each other
  5. 9. a single landmass
  6. 10. periods of thousands, millions, and billions, of years referred other scientists who study the earths history
  7. 12. outer part of the earth
  8. 14. a boundaries between tectonic plates that are moving towards each other
  9. 17. a scientist who uses fossil evidence to study life in prehistoric times
  10. 18. the size of a diagram or model in proportion to the actual size of a object
  11. 19. the middle part of the earth
  12. 20. a large natural elevation of the earth's surface
Down
  1. 1. a volcano that has not erupted for at least 10,000 years, but scientists think it may erupt again
  2. 2. an area where one tectonic plate is forced downward
  3. 3. a boundary between tectonic plates that are moving away from each other
  4. 8. part of the earth between the core and the the crust
  5. 11. a theory that the contents were attached together in the past, and have been falling apart ever since
  6. 13. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection in thought to occur
  7. 15. a sudden shaking of the ground
  8. 16. volcano built up of ash or lava