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UPSC CSE Pre 2018
Question #5
Climatology
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Consider the following statements:
1. The Earth's magnetic field has reversed every few hundred thousand years.
2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide.
3. When living organisms originated, they modified the early atmosphere of the Earth.
Which of the statements given above is/are correct?
A
1 only
B
2 and 3 only
C
1 and 3 only
D
1, 2 and 3
Pick an option above to test your answer
Reveal Answer ⌄
Subject:
Geography
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Q: Consider the following statements: 1. The Earth's magnetic field has reversed every few hundred thousand years. 2. When ... | UPSC CSE Pre 2018 PYQ | UPSCGPT