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Explain why the surface of a lake freeze...

Explain why the surface of a lake freezes first.

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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

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