River's Plate Tectonics Crossword Puzzle

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