GyanGramConsider the following statements: 1. The Earth's magnetic field has reversed every few hundred thousand year…
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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?
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• Correct Answer: C
• Earth's magnetic field has reversed polarity multiple times, last being Brunhes-Matuyama reversal ~780,000 years ago.
• Early Earth atmosphere had negligible free oxygen; photosynthetic cyanobacteria caused Great Oxidation Event.
• Statement 2 is wrong: early atmosphere had CO2 and water vapour, not 54% oxygen.
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