When a lot of dry powder of a substance X is released over a fire, the fire gets extinguished.
Name the substance X.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Problem:**
The question states that a dry powder of a substance X is released over a fire, and this action extinguishes the fire. We need to identify what substance X is.

2. **Identifying the Characteristics of Substance X:**
The substance must have properties that allow it to extinguish fire. Typically, substances that can do this either remove heat, exclude oxygen, or inhibit the chemical reactions that sustain fire.

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