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 ?
Options
(a)1 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
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Class 11The Origin and Evolution of the Earth— NCERT Geography, Chapter 2. Early theories explained only the earth and planets: the nebular hypothesis of Kant, revised by Laplace (1796) and again by Otto Schmidt and Carl Weizsäcker (1950), had…
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