Across
- 2. a long, narrow hole that is dug in the ground; ditch
- 3. a mountain with a hole in the top or side that sometimes sends out rocks,ash,lava, etc.
- 5. the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another
- 7. actively deforming region where two or more tectonic plates more toward one another and collide
- 9. a current in a fluid that results from convection
- 13. a long, steep valley formed when two parallel rift form in the Earth's crust and the land between them sink
- 15. when 2 plates slide or move away from one another
- 17. a divergent tectonic plate located along the floor of the Atlantic Ocean
- 18. a shaking of a part of the Earth's surface that often causes great damage
- 19. relatively thick part of the Earth's crust that forms the large landmasses
Down
- 1. a super continent that exist during the early ages
- 2. places where plates slide sideways past each other
- 4. a split or crack in the ground
- 6. an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust is formed
- 8. theory that states the lithosphere of the Earth is divided into small numbers of plates
- 10. a line of mountains connected by high grounds
- 11. each of several large landmasses thought to have divided to form the present continent
- 12. an area in the basin of the Pacific Ocean where several of earthquakes and volcanic eruptions occurs
- 14. an active strike-slip fault in West U.S. extending from San Franciso to South California
- 16. relatively thin part of the Earth's crust that underlies the ocean basins