A front can be found at the boundary between two or more air masses. There are two main types of fronts. According to this diagram, which front occurs when the warmer air moves over heavier, colder air (in the same direction)

Answer 1

The front that occurs when warmer air moves over heavier, colder air is called a warm front. In a warm front, the lighter warm air is forced to rise over the colder air mass, leading to gradual weather changes, often associated with clouds and precipitation.