The earth's magnetic field was flipped by 180 ° a million years ago. This flip was relatively rapid and took 10 5 years. Then the average change in orientation per year during the flip closest to

Step-by-step solution

1 ° = 3600   arc   sec average change in orientation per year = 180 ° 10 5   degree   year - 1 = 180 × 3600 10 5   sec   year - 1 = 1 . 8 × 0 . 36 = 6 . 48   sec   year - 1 Closest option (B)