* Heating: While heating a magnet can reduce its magnetic strength, it won't destroy it entirely. The magnetic properties of a material are related to the alignment of its magnetic domains. Heating causes these domains to become less aligned, weakening the overall magnetic field. However, unless you reach the Curie temperature (a specific temperature for each magnetic material), the magnet will regain its strength when cooled down.

* Freezing: Freezing a magnet has no significant effect on its magnetic properties. The temperature changes are not drastic enough to cause a significant realignment of magnetic domains.

To destroy a magnet completely, you would need to:

* Demagnetize it: This can be done by exposing the magnet to a strong alternating magnetic field. This field causes the magnetic domains to become randomly oriented, effectively eliminating the magnet's overall magnetic field.

* Melt it: Melting a magnet will change its physical structure and destroy its magnetic properties.

In summary: Heating and freezing can affect the magnetic strength of a magnet, but they won't destroy it completely. Demagnetization or melting are the only ways to completely destroy a magnet.