Across
- 2. a layer of plastic semi-soled rock in the lower mantle.
- 5. molten rock that has erupted onto the earths surface.
- 6. where the crust is sinking down into the earth.
Down
- 1. molten rock below the earths surface.
- 3. the crust that forms the ocean floor.
- 4. the process of continents breaking up, subsideing and allowing in the sea.