Metals react with oxygen to form ____ .

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Reaction**: Metals react with oxygen when they are exposed to it. This is a common chemical reaction that occurs in various environments.

2. **Formation of Metal Oxides**: When a metal reacts with oxygen, it forms a compound known as a metal oxide. The general reaction can be represented as:
\[ \text{Metal} + \text{Oxygen} \rightarrow \text{Metal Oxide} \]
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