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Air above the equator behaves differently than air at other latitudes due to the Earth's rotation and the way solar radiation is distributed across the planet. Near the equator, the surface of the Earth receives more direct sunlight throughout the year than at any other latitude. This causes the air at the equator to be warmer than air at higher latitudes.
As the air at the equator is heated by the intense solar radiation, it becomes less dense and starts to rise. This process is known as convection. As the warm air rises, it creates a low-pressure zone near the surface. Cooler, denser air from higher latitudes moves in to replace the rising warm air , As the warm air continues to rise, it eventually cools down and loses its moisture in the form of rainfall.