Across
- 3. Where old crust sinks
- 4. happens as molten rock from Earth's mantle forces its way through divergent boundary openings in the oceanic crust.
- 6. Before the continental drift
- 7. The large, thick pieces the earth is broken up into
- 8. where tectonic plates move apart
Down
- 1. made up of Earth’s crust and the uppermost part of the mantle.
- 2. The shallow layer of mantle just below the Lithosphere
- 5. Seafloor spreading creates...