Metals are found in rocks, either in their unalloyed state or mixed with other metals. If there is enough metal in a rock to mak
e it worth our While to get it out, we call the rock ore, "Iron ore," or "copper ore," for example. These ores are found either on the surface of the ground where
they can be obtained easily or in veins and deposits underground where they must be mined.
What does the word unalloyed mean in this paragraph?
1. pure
2 undamaged
3. equal
4, perfect
