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Explain why the surface of a lake freeze...

Explain why the surface of a lake freezes first.

Text Solution

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Lakes first freeze on the surface because water has the maximum density at `4^@C` and the densest part sinks to the bottom. So the water at the bottom of the lake remains at `4^@C` and that of top is at `0^@C`, where it freezes by losing heat to the environment.
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Knowledge Check

  • Statement-1: Upthurst on a solid block of iron when immersed in a lake will be less on the surface than on the bed of the lake. Statement-2: On the surface of the lake density of water will be less than that at the bed and upthrust depends on the density of liquid.

    A
    Statement-1, is true, Statement-2 is true, Statement-2 is correct explanation for statement-1
    B
    Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explantion for statement-1
    C
    statement-1 is true, statement-2 is false
    D
    statement-1 is false statement-2 is true

  • In cold weather, aquatic animals survive even when water to the top layer of the lake freezes into ice because

    A
    they can breathe in ice
    B
    they have enough of accumulated oxygen inside them
    C
    their body structure is such that they can survive without oxygen
    D
    water has highest density of `4^@C` so underneath the top layer of ice there is layer of water

  • The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as :

    A
    Water pollution
    B
    Water hyacinth
    C
    Eutrophication
    D
    Water bloom

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