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Answer : Convection is a major factor in weather. The sun heats the earth's surface, then, when cooler air comes into contact with it, the air warms and rises, creating an upward current in the atmosphere. That current can result in wind, clouds, or other weather.

Explanation:

In the atmosphere convection happens when warm air on the ground rises into the atmosphere(clouds) and at the high altitudes the air becomes cold  causing the air to come back down to the surface.