Question

Tick() the correct answer:
1. When the air becomes hot, it becomes
(a) lighter
(b) heavier
(c) no effect
2. When water vapour condenses on dust particles, it forms
(a) fog
(b) dew
(c) hail
3. Rotation causes
(a) day and night
(b) season
(c) month
4. Water can be purified by the following processes
(a) filtration
(b) chlorination
(c) both
please give me right answer and please fast​

Answer 1

Answer:

1a

2à

3a

4ç

it is right answer