An old iron battery was discarded in this meadow. the iron in the battery is undergoing a change as it rusts. the rusting is changing the battery's color from black to orange.

a) physical
b) chemical
c) environmental
d) none of these changes are occurring

i just want the answer.

If 2 different solids have the same masses but different volumes, how will their densities compare? a. the solids will have the same densities. b. the solid with lower volume will have a higher density. c. the solid with greater volume will have a higher density. d. the solid with greater volume will have double the density of the solid with the lower volume.