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Why do lakes freeze from top towards bot...

Why do lakes freeze from top towards bottom ?

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Why do lakes freeze form water top towards bottom?

Given reasons (i) Lakes freeze form top towards bottom. (ii) Ice floats on water.

Knowledge Check

  • The ionization potential of elements in any group decreases from top to bottom. This is due to

    A
    Increase in size of atom
    B
    Increase in atomic number
    C
    Increase in screening effect
    D
    Both increase in size of atom and increase in screening effect

  • The first fractional product of petroleum from top to bottom is

    A
    diesel
    B
    petrol
    C
    petroleum ether
    D
    kerosene

  • As one moves down the group from top to bottom then which of the following will not be observed?

    A
    Ionisation energy increases
    B
    Electron affinity decreases
    C
    Electronegativity decreases
    D
    Atomic radii increase

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