Vehicles carrying inflammable materials usually have chains that hang down and drag on the ground. Why?

Explanation

To understand why vehicles carrying inflammable materials have chains that hang down and drag on the ground, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Inflammable Materials**:
- Inflammable materials are substances that can easily catch fire. This characteristic makes it crucial to prevent any potential ignition sources while transporting them.

**Hint**: Think about the properties of the materials being transported and why they are labeled as inflammable.
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