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
Earth SciencesEarth's Magnetic Field and Early AtmosphereEarth's magnetic fieldreversedfew hundred thousand yearsEarth's creation4000 million years agooxygencarbon dioxideliving organismsearly atmosphere