Question

what is earth magnetic field

Answer 1

it is a magnetic field around earth which arises from the 2 poles of our Earth, and which save us from solar flares which arises from Sun and after hitting our magnetic field the formation of beautiful Arora on North Pole take place

Answer 2

if you have heard about magnetic poles of earth just like that earth has a magnetic field . we should thanks for the magnetic field of Earth because it protects us from solar fair which can cause a great harm to earth it is an interesting fact that every year sun emits a lot of flairs that had taken us to extinction without earth magnetic field.
there is a fact also that earths magnetic field is gradually getting depleted and about 500 hundred years ago it became more faster.