Why do we have wind, rain, heat, cold, snow, and sunshine on
our planet? It's all due to what's called "weather".
Changes in weather occur in the lowest atmosphere called the "troposphere". Since the sun heats the earth unequally, it causes the changes in weather people see around the world. That is why it can be cold and rainy in one area, and sunny and hot in another.
The sun shines the most on the middle part of the earth, while the least on the north and south ends. The heat from the sun can also cause thunderstorms. People who study weather are called Meteorologists.