A) Earth's magnetic field is due to electric current induced in the ionosphere.
B) The average magnetic field strength in the Earth's outer core is equal to the magnetic field at the surface
C) Earth's magnetic field reverses at an average interval of approximately 3,00,000 years.
D) Angle of dip is same at every point of the surface of Earth.
Correct Answer: C
Solution :
(c) Earth's magnetic field reverses at an average interval of approximately 3.00,000 years. Based upon the study of lava flows throughout the world, it has been proposed that the Earth's magnetic field reverse at an average interval of approximately 3.00,000 years.
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