Answer and Explanation:
The fronts are imaginary lines that separate two air masses of different temperatures. It takes too long for these two masses to mix, causing numerous atmospheric phenomena.
A hot air mass meets a cold air mass. The cold air is heavier and takes a wedge shape under the hot air that rises following a kind of ramp that constitutes the front line.
In the contact area, the hot air cools to the point of condensation and forms clouds that cause precipitation. These warm fronts originate weak but continuous rains.
