Answer the following question given this paragraph: When the ore leaves the mine, it is not yet a useful material ( Figure below ). Most ores are a combination of metal and other elements. The rocks are full of valuable minerals. They also contain rock that isn't valuable, which is called waste rock. The valuable minerals must be separated from the waste rock. Q: Along with other elements, most ores are made of what? A:
Select from the following. a. coal; b. crystals; c. sodium; d. metal;
d.