The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the rea

Question

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?

Accepted Answer

The correct answer is C because of the anomalous expansion of water. Most liquids contract and become denser as they cool, but water reaches its maximum density at 4 degrees Celsius.

As a lake cools in winter, the surface water becomes denser and sinks until the entire body of water reaches 4 degrees Celsius. Upon further cooling, the surface water becomes less dense and stays at the top until it freezes into ice. Since the densest water at 4 degrees Celsius stays at the bottom and ice acts as an insulator, the lower layers remain liquid, allowing aquatic life to survive even when the surface is frozen.

Answer

Ice is a bad conductor of heat

Answer

Since the surface of the lake is at the same temperature as the air, no heat is lost

Answer

The density of water is maximum at 4°C

Answer

None of the statements (a), (b) and (c) given above is correct

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?

Explanation

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