Science
Across
- 1. current, a current caused by the rising of heated fluid and sinking of cooled fluid
- 7. spreading, The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
- 8. tectonics, the theory that Earth's surface is broken into large, rigid pieces that move with respect to each other
- 9. when two plates rub against each other
Down
- 2. when two plates collide
- 3. when two plates separate
- 4. is when a plate goes under another plate mid-ocean mid ridge when plates separate lava comes out.
- 5. valley, when the plates separate and the land in the middle goes down
- 6. drift,Wegener's hypothesis which suggested that the continents are in constant motion on Earth's surface
- 8. all continents were once part of a super-continent before it began to break apart ~200 million years ago