What feature makes the phase diagram of water unusual?

Name: What feature makes the phase diagram of water unusual?
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Question

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The phase diagram of water is unusual because of the negative slope of the solid-liquid equilibrium line (E). This means that as pressure increases, the melting point of ice decreases, which is contrary to most other substances. This is why ice floats on water; as pressure is applied, ice tends to melt rather than freeze, indicating a unique behavior in its phase diagram.

What Feature Makes the Phase Diagram of Water Unusual