Across
2. The process of coating of thin layer of zinc on iron
6. The full form of CNG
7. The inactive component of air
9. The process of coating of thin layer of tin on iron
10. Air is considered as
12. The process of burning of a substance in the presence of air
13. With increase in height the percentage of oxygen in air _____
Down
1. The full form of LPG
3. Lime water is the solution of
4. Greenhouse gas
5. The gas essential for photosynthesis
6. The green pigment required for photosynthesis is
8. The slow conversion of iron into its hydrated oxide is
10. Carbon dioxide turns lime water
11. The gas essential for combustion
