Question

1. Sometimes in very cold places water pipes burst. Give reason why.

Answer 1

When is very cold, water freezes in pipes expanding and turns into ice. This frozen water is expanding and bursting pipe. 

Answer 2

Water is the only known substance that gets BIGGER when it freezes.
That's why ice cubes float in liquid water, and the reason that pipes
or cans of soda spring leaks when the liquid water that they're full of
freezes and gets bigger.