Draw a graph to show the variation in density of water with temperature in the temperature range $0^{\circ }C to {10}^{\circ }C$

A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer

(i) Just in contact with the ice.

A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer

(i) at the bottom of pond.

Explain the following :

(a) Water pipes in colder countries often burst in winters.

Explain the following :

(b) In winter, water tank start freezing from the top not from the bottom.

Explain the following :

(c) Fishes survive in ponds even when the atmospheric temperature is well below $0^{\circ }C$.