Across
- 5. a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
- 8. is the edge of a continent that is underwater
- 9. An underwater mountain chain where new ocean floor is formed
Down
- 1. the theory that explains how large pieces of Earth's outermost layer, called tectonic plates, move and change shape
- 2. to be carried away by water or air
- 3. a valley formed by the separation of tectonic plates
- 4. any movement of matter that results from differences in density; may be vertical, circular, or cyclical
- 6. The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
- 7. are the traces or remains of organisms that lived long ago.