Across
- 2. the way geoligsts thought continents moved over time
- 10. directly above the outer core
- 11. gravitational force at the spreading ridges
- 12. when gas or lava is released through a volcano its called an __
- 13. molten rock ejected by volcanoes in the form of liquid is called
- 14. the edge of one crustal plate descneding below the edge of another
- 18. the formation of new areas of oceanic crust
- 19. when two blocks of earths surface slip past each other it causes a ___
- 20. a string of volcanoes and earthquakes around the Pacific ocean
Down
- 1. an opening in the earths crust which lava, volcanic ash, and gases escape
- 3. these form when magma cools and it reaches earths surface
- 4. a fracture or zone of fractures between two blocks of rock
- 5. gravitational pull in subduction zones
- 6. the boundary when plates move away from each other
- 7. the boundary when plates move towards each other
- 8. the boundary when plates slide past each other
- 9. mixture of rock,mineral, and glass particles from a volcanic eruption
- 15. a bowl shaped depression directly above the vent of a volcano
- 16. the outermost shell of a terrestrial planet is called
- 17. a massive, and steep sided, raised portion of earths surface is called what?