Consider the following statements: 1. The Earth's mag

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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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1. ?????? ?? ??????? ??????? ?? ??? ???? ?????? ??? ??? ??? ???

2. ?? 4000 ??? ???? ?????? ?? ??????? ??? ??, ?? 54% ??????? ?? ??? ?????? ?????????? ???? ???

3. ?? ????? ????? ?? ???????? ???, ?? ???????? ?????? ?? ????????? ??????? ?? ??????? ?????

??? ??? ?? ????? ??? ?? ??? ?? ??? ?? / ????

[UPSC IAS Prelims 2018]

A (a)1 only

(a) केवल १

B (b)2 and 3 only

(b) २ और ३ ही

C (c)1 and 3 only

D (d)1, 2 and 3

(d) 1, 2 और 3

Statement 1 is correct. Earth's magnetic field has flipped its polarity many...

??? ? ??? ??? ?????? ?? ??????? ??????? ????????????? ?? ?? ??? ???? ??????? ?? ...

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