Which statement is true regarding the permanence of magnetism in objects?

The statement that objects can lose their magnetism over time is accurate because many magnetic materials, particularly temporary magnets, can have their magnetism diminished or entirely lost due to various factors. For instance, exposure to heat, strong mechanical shock, or external magnetic fields can cause atoms within a material to lose their alignment, which is essential for maintaining magnetism. This process illustrates that not all objects retain their magnetic properties indefinitely.

In contrast, the other statements do not accurately reflect the nature of magnetism. While some materials, such as certain steels, can be made into permanent magnets, it is not true that all objects are permanently magnetic. Furthermore, magnetism is not exclusive to metals; other materials may also display magnetic properties under certain conditions. Lastly, stating that all objects are non-magnetic is incorrect, as many substances exhibit magnetic characteristics, including ferromagnetic materials. Hence, the understanding that magnetism can diminish over time is crucial for comprehending the behavior of magnetic materials.