Solve the crossword Puzzle by using the clues given below.
Across:
1. A gas that supports combustion.
4. The compound that turns lime water milky.
5. The Gaseous jacket that surrounds the Earth.
6. It is used as a refrigerant.
7. Solid form of carbon dioxide.
Down:
2. The process by which atmospheric nitrogen is converted into nitrates.
3. The common name of the compound formed when nails are exposed to moist air.
8. It changes the fertility of the soil, destroys plants and aquatic life
