Across
- 2. Plate boundary where two plates slip past each other
- 4. Famous string of volcanoes
- 6. A molten mixture of gases, water, and rock-forming substances from the mantle
- 9. Crust that is on the land under mountains
- 13. Valley where the sea floor subducts back into the mantle
- 14. The process of continually adding new material to the ocean floor
- 15. Liquid magma at the surface
- 17. A process in which one plate goes under another at a convergent boundary
- 19. The stress force that pulls on the crust, and thins rock in the middle
- 20. Underwater mountain chain where sea floors are renewed
Down
- 1. Plate boundary where two plates collide
- 3. Crust under the ocean
- 5. Breaks in Earth's crust where rocks have slipped past each other
- 7. A curved chain of volcanoes located at the edge of a plate
- 8. Forms where pieces of Earths crust separate
- 10. The stress force that squeezes the crust, forming mountains
- 11. A vent on the surface where magma escapes from the mantle
- 12. The outer layer of Earth
- 16. An area where magma melts through the crust above it
- 18. Plate boundary where two plates move away from each other