Some changes are _________ while some are slow.

Explanation

**Step-by-Step Solution:**

1. **Understanding Changes**: Changes around us can be categorized into two types based on the time they take to occur: fast changes and slow changes.

2. **Defining Fast Changes**: Fast changes are those that occur in a very short amount of time, typically within seconds or minutes.

3. **Examples of Fast Changes**: Common examples of fast changes include:
- Burning of paper: This happens quickly as the paper ignites and turns to ash.
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