Across
- 1. extremely disastrous and sudden
- 4. a gray, lightweight volcanic rock that is full of small hole
- 6. rock that has been melted by high heat; lava
- 7. a sudden and quick movement of rocks and dirt down the side of a mountain or hill
- 8. the scattered pieces of something that has been broken or destroyed
Down
- 2. a cloud made up of tiny rock pieces that shoot out of a volcano when it explodes
- 3. a large sheet of ice formed from layers of snow that do not melt and get pressed together
- 4. a very hot mixture of rock, ash, and gas that races down the sides of an erupting volcano
- 5. a period in history when a large part of the Earth was covered with ice