Across
- 4. a group of the same species living in the same area
- 5. pressure and temperature result at depth
- 6. large pieces of lithosphere that interact along their boundary
- 10. extinction for a time
- 14. the semifluid layer of the mantle where currents occur
- 15. an opening in the crust where molten rock is expelled
- 16. Hot material floats and cold material sinks and immobilizes the tectonic plates.
- 17. instruments for measuring seismic waves
- 18. ancient supercontinents
- 20. plates move between them and create mountains
- 21. created by erosion when two sediments compact
Down
- 1. crust and upper mantle that include tectonic plates of the earth
- 2. The plates separate and form oceanic crust
- 3. events that lead to extinction
- 7. areas of weakness of crust
- 8. the rock created when lava cools
- 9. plates slide and create earthquake
- 11. plates move away and form and form new crust and cracks
- 12. They form when plates collide
- 13. located between the hand and the outer core
- 19. elongated ocean depressions with subduction