Which of the following is responsible fo...

Which of the following is responsible for the earth's magnetic field ?

A

A freely ssuspended bar magnet always point in the random direction

B

A large quantity of iron ore is found burried in the earth

C

The intensity of cosmic rays of charged particles daming from space to earth is more at the poles than at the equator

D

The earth is surrounded by an ionosphere (a shell of charged particles)

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