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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CollectorBabu · Accepted Answer

Correct Answer: 1 and 3 only. ● A change in the Earth’s magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north is called as geomagnetic reversal. Complete magnetic reversals have happened every 200,000 to 300,000 years. ● The earliest atmosphere contained carbon dioxide, methane, water vapour, carbon monoxide, little nitrogen and hydrogen.

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