Across
- 1. a safe place that protects people
- 4. very small dry bits of dirt or rock
- 6. the force that pulls things down
- 7. stay alive in a difficult place
Down
- 2. a place designed for people to live and work
- 3. the outside top layer of something
- 5. the gas people need to breathe
- 7. something provided for people to use