Match column 1 with column 2:
| Column - 1 | Column - 2 |
| 1. Drought | a. Collection of rooftop rainwater for further use |
| 2. Water harvesting | b. A mixture of water vapour, dust particles and air |
| 3. Cloud | c. A situation caused by no rain |
| 4. Hail | d. Pellets of frozen rain which fall in showers from clouds |
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