River's Plate tectonics crossword

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