Answer:
1. c. ore, 2. ore minerals or economic minerals
Step-by-step explanation:
- An ore is a naturally occurring rock that contains sufficient minerals and important elements and typically metals. Ore metals are naturally found in the crust of the earth like the oxides of sulfur and silicate. Formed by a variety of geologic processes.
- Crystals are a solid material thus have a fairly well-defined composition in the rocks and hence valued as a useful element by forming the internal structure of the mineral.