GEOLOGY

Detailed explanation-1: -Ferromagnetic Domains Each domain acts like a tiny magnet with a north and south pole. If an object remains a magnet even when removed from the other magnetic field it is called a permanent magnet. If alignment is made in the presence of a permanent magnetic field, the object is a temporary magnet.

Detailed explanation-2: -A: When metal objects that contain iron (and this includes many scissors) are exposed to magnets, they sometimes become magnets themselves.

Detailed explanation-3: -A: Jarring or heating a magnet moves the magnetic domains out of alignment. When the magnetic domains no longer line up in the same direction, the material is no longer magnetic.

Detailed explanation-4: -Depending on the material, the domains will stay lined up together in the same direction even after the external field is gone. The domains do not instantly return to normal. This tendency to stay aligned is called hysteresis. Hysteresis is what allows us to make permanent magnets.