Across
- 2. Molten rock once it has erupted onto the Earth's surface.
- 4. A crack in the Earth's crust where rock has moved.
- 5. the process of wearing or being worn by long exposure to the atmosphere.
- 6. A mountain or hill, typically conical, having a crater or vent through which lava and ash are or have been erupted.
- 9. The process of moving weathered rock and soil by wind, water, or ice.
- 10. The circular movement of heat in the mantle, thought to be the driving force behind plate tectonics.
Down
- 1. A type of boundary where two tectonic plates move apart from each other, creating new crust. (← →)
- 3. The upper layer of the Earth's mantle, just below the lithosphere, on which the plates float.
- 7. A deep valley with steep sides, often carved by a river over millions of years.
- 8. A type of boundary where two tectonic plates collide, often forming mountains or volcanoes. (→ ←)