Across
- 2. is the most abundant gas in our atmosphere
- 5. it's all around us
- 6. cattle Produce this from digestive track
- 8. process plants absorbing sun
Down
- 1. is the 2nd most abundant gas on earth
- 3. the layer
- 4. gases important for life on earth
- 5. it's everywhere
- 7. large body of matter