Across
- 4. The process that forms new ocean floor and oceanic crust. Magma oozes up from the mantle through a crack in the ocean floor, filling in the space between the plates and spreading out from the plate boundary.
- 5. movement is felt as an earthquake.
- 6. The type of crust lying under the oceans of the world. It is only 4 to 6 miles (7 to 10 km) thick and usually younger than continental crust.
- 7. (35 to 70 km) thick and very old.
- 12. The border between two tectonic plates
- 13. A deep valley that forms at the edge of a continent when an oceanic plate sinks underneath a continental plate.
- 16. occurs where two plates
- 18. occurs where one plate slides under another as the two are pushed together.
- 20. The place where a collision between two continental plates crunches and folds the rocks at the boundary, lifting them up and leading to mountain formation
- 21. grind past each other in a horizontal direction
Down
- 1. A raised area or mountain range under the oceans formed when magma fills the space between two tectonic plates that are spreading apart.
- 2. occurs where two plates slide against each other. But rather than sliding smoothly, the plates build up tension, then release the tension with a spurt of movement.
- 3. there is land at the edge of one of these plates,the ocean plate will subduct, or slide under that plate.
- 8. Zone, The place where one plate is getting bent and pulled under the edge of another plate.
- 9. A crack or fracture in
- 10. zone
- 11. layer of the earth's crust that lies under the seven continents. It is about 20 to 40
- 14. crust where two tectonic
- 15. apart, allowing magma, or molten rock, to rise from the Earth' s interior to fill in the gap. The two plates move away from each other like two conveyor belts moving in opposite directions.
- 17. two tectonic plates are pulling apart.
- 19. A
- 21. The name given to the supercontinent that existed more than 225 million years ago, in which the present-day continents were joined together in one large landmass.