Which is the average length of a period during which a given magnetic field polarity exists?
A)10 000 years.
B)100 000 years.
C)500 000 years.
D)1 000 000 years.

Question

Quizplus · Accepted Answer

The average length of a period during which a given magnetic field polarity exists is 500,000 years. This is based on studies of the Earth's magnetic field over the past 4 million years, which have shown that the polarity of the magnetic field reverses on average every 500,000 years. This is known as the magnetic polarity timescale.

Which Is the Average Length of a Period During Which