Across
- 5. the trapping of the sun's warmth in a planet's lower atmosphere
- 6. plants give off oxygen and absorb?
- 9. tropical forest
- 10. kind of rain that is harmful to environment
Down
- 1. action of surface processes
- 2. harmful uviolet light from Sun to the Earth
- 3. the mountain with a large circular hole on the top through which lava gases
- 4. what chemical is contained in a spray can?
- 7. abnormally low rainfall, leading to shortage of water
- 8. the variety of plant and animal life in the world