Under which situations can an amorphous substance change to crystaline form?

Explanation

To determine under which situations an amorphous substance can change to a crystalline form, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Amorphous and Crystalline Solids**:
- Amorphous solids lack a well-defined structure; their particles are arranged randomly.
- Crystalline solids have a regular, repeating arrangement of particles.

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