Recycled glass can be used as a substitute for
(Scrap metal, Asphalt, Concrete, Gravel or sand)

Explanation

**Step-by-Step Solution:**

1. **Understand the Question**: The question asks which material recycled glass can substitute for among the given options: scrap metal, asphalt, concrete, gravel, or sand.

2. **Identify the Relevant Information**: The video mentions that researchers from Dickin University have found that recycled glass can be used as a substitute for certain materials.

3. **Analyze the Options**:
- **Scrap Metal**: Typically consists of metals and is not related to glass.
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