Plate tectonics
Across
- 1. continents are in constant motion on the surface of earth
- 3. New oceanic crust forms along a mid-ocean ridge and older oceanic crust move away from the ridge
- 5. magnetic field reverses directions
- 6. the cold and ridge outermost rock layers are called
- 8. continents were once part of a supercontinent called
- 10. The mountain range in the middle of the ocean are called
Down
- 2. Forms where two plates seperate
- 4. polarity, magnetic objects such as compass needles , will orient themselves to point north
- 7. earths surface is made of ridge slabs of rocks or plates , that move with respect to each other
- 9. polarity, reverse direction and orient themselves and point south