There are several reasons why pipes can burst, including:

1. Freezing temperatures: When temperatures drop below freezing, the water inside the pipes can freeze, causing them to expand and eventually burst.
2. Age: Older pipes can become weakened over time, leading to cracks and leaks that can eventually result in a burst.
3. Corrosion: Pipes can corrode due to the chemicals in the water or soil, which can weaken the material and make it more prone to bursting.
4. High water pressure: If the water pressure in the pipes is too high, it can put too much stress on the pipes and cause them to burst.
5. Physical damage: Pipes can be damaged by physical force, such as from construction work, accidental impacts, or tree roots growing into the pipes.
6. Clogs: If there is a blockage in the pipes, it can cause pressure to build up, which can lead to a burst.
7. Poor installation: Pipes that were not installed correctly or with the proper materials can be more prone to bursting.
8. Water hammer: When water flow is suddenly stopped or redirected, it can create a shock wave that puts stress on the pipes and can cause them to burst.
9. Poor maintenance: Lack of maintenance, such as failing to repair leaks or replace worn out pipes, can lead to a burst.
10. Natural disasters: Natural disasters such as earthquakes or floods can cause pipes to burst due to the stress put on the infrastructure.