Give two examples of non-combustible substance.

Answer

**Step-by-Step Solution:**

1. **Understanding Non-Combustible Substances**:
- Non-combustible substances are materials that do not easily ignite or burn in the presence of air (specifically, oxygen). This means they do not support combustion.

2. **Identifying Examples**:
- To provide examples, we need to think of materials that are known for their resistance to burning. Common examples include glass and stone.

3. **Listing the Examples**:
- Example 1: Glass
- Example 2: Stone

4. **Conclusion**:
- Therefore, two examples of non-combustible substances are glass and stone.

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