GEOLOGY

Detailed explanation-1: -A permanent magnet is one that retains its magnetic properties for a long period of time. Examples are iron, nickel, cobalt and some rare earth alloys etc. Temporary magnets are those that simply act like permanent magnets when they are within a strong magnetic field.

Detailed explanation-2: -After being magnetized, a permanent magnet will retain the properties of magnetism indefinitely. A temporary magnet is a magnet made of soft iron, that is usually easy to magnetize; however, temporary magnets lose most of their magnetic properties when the magnetizing cause is discontinued.

Detailed explanation-3: -Permanent magnets attain their magnetic properties forever. Temporary magnets attain their magnetic properties only when they are in a strong magnetic field. Once the magnetic field is removed, they lose their magnetic properties. Permanent magnets are usually found in nature.

Detailed explanation-4: -The magnitude of this loss will determine the lifespan of a magnet. This loss of magnetic strength will occur in a permanent magnet at the temperature of 80oC. But, a temporary magnet, on the other hand, can lose its magnetism within a single hour.