Question

earth behaves like a big magnet. justify​

Answer 1

the core of the earth has a high content of nickel and iron (and therefore the earth is also known as NIFE) which is the reason of the earth's magnetic field

hope this helps!

Answer 2

As earth core is made full of nickel and iron and those metal rotate they create a magnetic field of earth
si thus we could say that earth behaves like a big magnet