Q: 247 (SSC/NA)
question_subject:
Science
question_exam:
SSC
stats:
0,10,9,6,2,10,1
keywords:
{'abundant gas': [1, 0, 0, 0], 'atmosphere': [1, 1, 4, 7], 'carbon dioxide': [2, 0, 5, 6], 'gas': [9, 1, 9, 27], 'ozone': [3, 0, 3, 5], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'volume': [0, 0, 1, 0]}
The correct answer is option 3: Oxygen. Oxygen is the second most abundant gas by volume in the Earth`s atmosphere. Nitrogen is the most abundant gas, making up about 78% of the atmosphere. Oxygen is the second most abundant at around 21%, followed by trace amounts of other gases like carbon dioxide and ozone. Ozone, which is option 2, is present in the atmosphere in relatively small concentrations and is primarily found in the ozone layer, which is a region in the Earth`s stratosphere. Carbon dioxide, which is option 4, is an important greenhouse gas, but it is present in much smaller quantities compared to nitrogen and oxygen. Therefore, option 3, Oxygen, is the correct answer.