Across
- 4. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
- 5. boundary between two colliding plates - keywords: ocean trench
Down
- 1. a boundary where two plates are moving apart - hint: create new crust
- 2. the process by which Earth's crust breaks apart
- 3. a theory proposed by Alfred Wegener that explains how large pieces of land called plates move and change shape of the earth.