Rusting of iron takes place only when both____ and ____ are present.

Explanation

**Step-by-Step Solution:**

1. **Understanding Rusting:** Rusting is a chemical process that occurs when iron reacts with certain elements in the environment. It results in the formation of rust, which is primarily iron oxide.

2. **Identifying the Conditions for Rusting:** For rusting to occur, two specific conditions must be met. These are:
- The presence of **oxygen** (from the air).
- The presence of **water** (moisture).

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