Across
- 4. a break in earths crust where slabs of rock slip past each other
- 5. the hypothesis that the continents slowly move across earths surface
- 6. a trace of an ancient organism that has been preserved in rock
- 7. a rigid layer made of the uppermost part of the mantle and crust
Down
- 1. the soft layer of the mantle where the lithosphere floats
- 2. the layer of hot solid material between the crust and core
- 3. a deep valley that forms where two plates move apart