Plate Tectonics by Tadhg

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Across
  1. 3. the rigid outer part of the earth
  2. 4. the point on the earth's surface vertically above the focus of an earthquake
  3. 5. a mountain or hill in which lava or hot fragments of rock erupt from
  4. 8. the force that attracts a body towards the centre of the earth
  5. 13. another name for core
  6. 16. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
  7. 17. an instrument that measures and records details of earthquakes
  8. 18. a thin layer of gases that surrounds the Earth
  9. 21. the outermost shell of earth
  10. 23. he solid mineral material forming part of the surface of the earth and other similar planets
  11. 24. the upper layer of the earth's mantle, below the lithosphere
  12. 27. the layer just beneath the crust
  13. 31. the centre of the earth
  14. 32. hot molten or semi-fluid rock erupted from a volcano or fissure
  15. 33. the branch of physics that deals with the deformation and flow of matter
  16. 36. relating to earthquakes or other vibrations of the earth and its crust
  17. 37. a sudden violent shaking of the ground
  18. 38. the branch of science concerned with earthquakes
  19. 39. a line on a rock surface or the ground that traces a geological fault
  20. 40. a volcano that will no longer erupt
Down
  1. 1. the person who came up with the Pangea theory
  2. 2. the science which deals with the physical structure and substance of the earth
  3. 6. a smaller earthquake following the main shock of a large earthquake
  4. 7. the great size or extent of something
  5. 9. hot fluid or semi-fluid material below or within the earth's crust
  6. 10. continuous physical force exerted on or against an object by something in contact with it
  7. 11. a dark fine-grained volcanic rock that sometimes displays a columnar structure
  8. 12. the outermost layer that we live on
  9. 14. a slight earthquake
  10. 15. the gradual movement of the continents across the earth's surface
  11. 19. a volcano that hasn't erupted in a long time but is set to erupt in the future
  12. 20. a large natural elevation of the earth's surface rising abruptly from the surrounding level
  13. 22. large-scale processes affecting the structure of the earth's crust
  14. 25. wave, an elastic wave in the earth produced by an earthquake or other means
  15. 26. the planet we live on
  16. 28. the hypothetical landmass that existed when all continents were joined
  17. 29. the powdery residue left after the burning of a substance
  18. 30. the region of the earth's interior between the crust and the core
  19. 34. a sharp change of pressure in a narrow region travelling through a medium
  20. 35. the mass of a substance per unit volume