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Which is a magnet?
A a paper clip
B and iron bar
C Earth
D a penny


Sagot :

C. Earth is a giant magnet because it was believed that the outer core is mostly made of molten iron and nickel. In Physics, hot moving metal creates a magnetic field. In this case, the outer cores moves in respect with the Earth's rotation and revolution, thereby creating a large magnetic field which prevents harmful rays of ions and solar wind from entering the Earth