Lakes and rivers do not freeze suddenly in winter.
A.True
B.False

Hint: The water freezes from liquid state to solid state when the heat of solidification is supplied to it. The heat of solidification is responsible for conversion of the state of water from liquid state to solid state. The amount of heat also depends on the temperature of the water and surroundings.

Complete Answer:
Whenever there is change in state of a substance then there is involvement of heat. When water freezes from liquid state to solid state and forms ice, then there is involvement of heat of solidification which is also known as latent heat of solidification. The heat of solidification is the amount of heat energy released when one gram of water is converted into solid state. During winter the amount of heat of solidification is much higher as compared to heat of solidification in summers. This is due to the fact that in winter the temperature of the surrounding area is much lower than that of summer. Therefore during the winter season the water of lakes and sea do not suddenly freeze as compared to summer. Thus the given statement is correct and it is true.

The correct option is A. True.

Note:
The amount of heat energy released when one gram of water is converted into solid state which is ice during the solidification process is known as the heat of solidification and it is generally measured in calories. Whenever there is change of state from one state to another state then latent heat is involved which is internal and depends on the crystal structure of the substances and the temperature of the surroundings.