<span>Nickel and cobalt are ferromagnets. This means that they are able to acquire magnetism from induction by an external magnetic field. This is caused by the realignment of atoms and unpaired electrons in their structure induced by the magnetic field. Aluminum and copper don't get magnetized because they have few unpaired electrons in their atomic structures. </span>
1. availableity of the resource 2. the environmental impact of the resource 3. the renewability of the resource 4. the cost of the resource 5. the amount of energy it can produce and of what kind