If you mean do they occur naturally then yes they do. that is what is causing your compass needle to dance when you are orienteering. Natural veins of metals are a common cause.
No. Magnetism and gravity are quite different forces. For starters, gravity acts on all masses, and the amount of force depends only on the masses and the distance - and it is always attractive. The...
Force of gravity is a pull force. Earth has this force. The earth pulls us towards its center so that we are standing on it. If it was to push we would be in space now.