Across
- 2. contamination of natural environment
- 6. working fluid used in the refrigerators and air conditioning systems which is harmful to environmnet
- 7. Layer that protects earth from harmful UV Rays
- 9. chemical element with the symbol C
Down
- 1. layers of gases that envelope a planet
- 2. Count of people in a given area
- 3. cutting of trees in the forest
- 4. unwanted sound considered unpleasant
- 5. The most essential liquid for life
- 8. Long term pattern of weather