Across
- 2. what released gases to form earths early atmospere
- 4. what main gas was produced by volcanoes
- 6. what does sulfur dioxide cause
- 7. what does particulates
- 9. what greenhouse gas is produced by animal farming
Down
- 1. what process caused carbon dioxide levels decrease
- 3. what does climate change cause
- 5. whats produced by incomplete combustion
- 8. what was one planet that the earths atmosphere was like before it changed