science7

1. By-product of photosynthesis
3. A thin, transition layer into outer space
5. The general condition of the atmosphere over an area within a specified period of time.
7. A synthetic chemical substance whose molecule can destroy a thousand molecules of ozone
12. Amount of water vapor which the air can absorb
14. Layer of atmosphere where temperature drops as low as -93ºC as the altitude increases
15. Layer of atmosphere where chemical reactions occur much faster due to increasing heat from the sun
16. The weight of all the air in the atmosphere pressing down on Earth
17. A self-recording thermometer that records the rise and fall of the temperature during the day
19. Intensification of the overall temperature of the earth's atmosphere
20. Absorbs ultraviolet radiation and transforms it to heat

2. Natural warming of the earth because of the presence of atmospheric gases
4. Enhanced by human activities like fossil fuel combustion and deforestation
6. Rich with charged particles or ions
8. Actual volume of water vapor in a volume of air in relation to its air capacity
9. Layer of atmosphere characterized by clouds, storms and all types of weather phenomena
10. Layer of atmosphere that is warm because of the absorption of ultraviolet radiation
11. The envelope of gases surrounding the earth
13. Solar energy absorbed by the troposphere and earth’s surface is converted to heat energy
18. Most abundant gas in the atmosphere