Across
- 3. An opening in the Earth's crust through which molten rock, rock fragments and hot gases erupt.
- 6. A dense cloud of superhot gases and rock fragments flowing downhill as fast as 100 mph.
Down
- 1. A _____ mountain forms as continental crust crumples and bends into folds.
- 2. When blocks of rock move up or down along normal fault lines, ______ mountains are formed.
- 4. A hot spring where water shoots into the air.
- 5. Rain that contain large amounts of acid is _____ rain.
- 7. Magma that has reached the earth's surface