Answer :
The condition that causes storms to occur is a sudden change in air pressure. When there is a rapid change in air pressure in the atmosphere, it can lead to the formation of storms. This change in pressure can be due to various factors like the movement of different air masses or the interaction of warm and cold air.
Here's why each of the other options is not the main cause of storms:
1. Freezing of water droplets: While freezing of water droplets is a process that can occur within storms, it is not the main cause of storms themselves.
2. Condensation of water vapor: Condensation of water vapor is an essential step in the formation of clouds and precipitation within a storm, but it is not the primary cause of storms.
4. Rapid heating of the upper atmosphere: Rapid heating of the upper atmosphere does not typically lead to storm formation; in fact, it is more likely to stabilize the atmosphere and reduce the likelihood of storm development.
In summary, a sudden change in air pressure is the key factor that triggers the formation of storms by setting in motion the complex processes that result in the development of severe weather conditions.
