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