Across
- 1. The opposite of dirty
- 2. In every place on Earth
- 5. All the plants, animals and land around us
- 6. The type of weather around you
- 7. Making lots of smoke
- 9. From nature: not man-made
Down
- 1. Becoming different
- 3. Person who studies science
- 4. Fuel we put in cars
- 8. What we breathe