Answer:
B. Sun
Explanation:
The energy that the Earth receives from the Sun is the basic cause of our changing weather. Solar heat warms the huge air masses that comprise large and small weather systems. The day-night and summer-winter cycles in the weather have obvious causes and effects.
The weather is just the state of the atmosphere at any time, including things such as temperature, precipitation, air pressure, and cloud cover. Daily changes in the weather are due to winds and storms. Seasonal changes are due to the Earth revolving around the sun.
