Ores.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Ores**:
- Ores are defined as natural deposits of one or more valuable minerals found in the Earth's crust. These minerals can be extracted and processed for various industrial and economic purposes.

2. **Importance of Ores**:
- Ores are crucial because they contain metals and other materials that are essential for manufacturing and construction. They are the primary source of metals like iron, copper, and silver.

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