River's Plate Tectonics Crossword Puzzle

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Across
  1. 3. a large natural elevation of the earths surface
  2. 8. sea trench hemispheric-scale long but narrow topographic depressions of the sea floor
  3. 9. crust that part of the earth's crust that underlies the continents and continental shelves
  4. 10. movement caused within a fluid by the tendency of hotter and therefore less dense to rise
  5. 13. a theory explaining the structure of the earth's crust
  6. 15. the crust and upper mantel of the earth
  7. 16. sub sea chasm extending along the crest of a mid-ocean ridge, locus of the magma upwelling that accompany seafloor spreading
  8. 17. rising or falling, increasing or decreasing, according to a standard or to a set of conditions
  9. 19. is the place where two plates meet
Down
  1. 1. hit with force
  2. 2. merging
  3. 4. upper layer of earth's mantel
  4. 5. vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals
  5. 6. long narrow steep-sided depression in the earth's oceanic crust
  6. 7. hot molten or semi-fluid rock erupted from a volcano or surface
  7. 11. long mountain range on the ocean floor
  8. 12. the strength and vitality required for sustaining physical or mental activity
  9. 14. to change in form, appearance of structure
  10. 18. core solid sphere in the middle of the fluid core such as the iron-nickel core of the Earth
  11. 20. limit