State two necessary conditions for rusting.

Explanation

To answer the question "State two necessary conditions for rusting," we can follow these steps:

### Step-by-Step Solution:

1. **Define Rusting**: Rusting is a chemical process that occurs when iron reacts with oxygen in the presence of moisture, leading to the formation of rust, which is primarily composed of iron oxides.

2. **Identify Necessary Conditions**:
- **Condition 1**: Presence of Air (Oxygen) - Rusting requires oxygen, which is present in the air. Without oxygen, the rusting process cannot occur.
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