engineering recuitment HPCL Engineer Mock Test 2024 People Development & Environment Environmental Issues Ozone Layer Depletion
Consider the following statements regarding ozone:
1. It is continuously being produced and destroyed
2. It helps to sustain life on earth
3. It is formed in the atmosphere through photochemical reaction
Which of the above statements are correct?
1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2 and 3