Earth's Magnetic Field (details)

Question

Which of the following IS NOT TRUE about Earth's magnetic field.

Choose one.

A. Earth's magnetic field has undergone reversals at least nine times in the last 4.5 million years.

B. At irregular intervals, every 300,000 to 500,000 years, earth's magnetic field reverses direction.

C. Changes in the magnetic field through time results from subtle variablity generated by the orbital interactions of Earth and other planets.

D. Magnetic properties of rocks around the world indicate that Earth's Magnetic Field wandered to its current position from a location much farther south.

Answer 1

c

NEXT TIME DO YOUR OWN HOMEWORK

Answer 2

We don;t really understand why the polarity of the field changes - but it does.

And if it was to do with orbital interactions etc it would be quasi-periodic - its not

So the false answer is C