River's Plate Tectonics Crossword Puzzle

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