When a warm air mass moves into an area of cooler air, the boundary between the air masses is called a warm front. The warmer, less-dense air slides up over the cooler, denser air in a wide, gentle slope. As the warm air cools, its relative humidity increases, and the water vapor condenses into clouds.
The Lake Victoria is located in the Great Rift Valley. Among the choices given above, that statement is the most accurate. The Nile River is among the many bodies of water that originates in Lake Victoria.
