Question

What do you mean by anomalous expansion of water? What is its importance in nature?

Answer 1

Anomalous expansion of water

1. The anomalous expansion of water is an abnormal property of water whereby it expands instead of contracting when the temperature goes f m $4^{°}C$ to$0^{°}C$, and it becomes less dense.
2. The density is maximum at $4^{°}C$ and decreases below that temperature.

Its importance in nature

1. Preservation of aquatic ecosystem.
2. Weathering of rocks.