Name two substances having low ignition temperatures and two having high ignition temperatures.

Explanation

To answer the question about substances with low and high ignition temperatures, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ignition Temperature**:
- Ignition temperature is defined as the minimum temperature at which a substance will ignite and start to burn.

2. **Identifying Substances with Low Ignition Temperature**:
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