Final answer:
New substances made through oxidation are generally more voluminous than the original minerals due to changes in crystal structure or composition, and these oxidized minerals can be softer and more easily eroded.
Step-by-step explanation:
The new substances made through oxidation of existing minerals are typically more voluminous than the original minerals. When minerals oxidize, they often undergo a process that involves the addition of oxygen or loss of electrons, which can lead to an increase in volume. This is due to the fact that oxidation can cause a change in the mineral's crystal structure or composition, often resulting in a more porous and less dense material. For example, the oxidation of iron-bearing minerals can lead to the formation of iron oxides, such as rust, which is less dense and occupies more space than the original iron mineral. In addition, these oxidized minerals can sometimes be softer and more easily eroded than their unoxidized counterparts.