The Atmosphere

2. Gaseous layer that surrounds the Earth.
4. The main source of CO2, NOx, SOx and particulate matter is the burning of ___________ fuels.
6. Atmospheric ___________ is the presence of anything in the air that can harm the health of living beings.
9. Force that holds the atmosphere in place.
11. Increased ___________ dioxide levels are responsible for global warming.
14. Pollutant which can produce psychological issues.
15. Commercial aeroplanes fly at the top of this layer.
18. Most abundant gas in the atmosphere.
20. Higher altitudes have a lower air ___________.
21. ___________ are produced in the thermosphere when solar winds interact with the Earth’s magnetic field.
24. Layer in which the ozone layer is located.
26. Any type of substance and any form of energy present in the air which is harmful for life on Earth.
27. Shooting stars are ___________ that disintegrate in the mesosphere.
28. Natural phenomenon (where certain atmospheric gases trap heat) that keeps the Earth’s surface warm: ___________ effect.

1. Acid rain produces water and soil ___________.
3. Ozone depletion is caused by ___________ gases that react with ozone.
5. Pollutant which alters animal life cycles.
7. Gas which appeared in the atmosphere thanks to photosynthetic organisms.
8. Nitrogen is an essential gas for life because it’s used to construct ___________
10. ___________ rain is the phenomenon caused by NOx and SOx pollutants in the atmosphere reacting with water vapour.
12. Homogeneous mixture of gases which is present in all the atmosphere but it’s not distributed homogeneously.
13. Gas which protects us from ultraviolet rays.
16. X-rays are absorbed in this layer.
17. The Earth’s surface emits ___________ radiation when it is heated by the sunlight.
19. Boundary between the mesosphere and the thermosphere.
22. Layer in contact with outer space.
23. ___________ pollutants are produced in the atmosphere by reactions caused by solar radiation (eg: tropospheric ozone).
25. Effect caused by particulate matter, NOx, VOCs and secondary pollutants like tropospheric ozone.