Final answer:
The four types of fronts are warm fronts, cold fronts, stationary fronts, and occluded fronts. They form when air masses collide and lead to different weather changes depending on the type of front. Warm fronts bring gradual weather changes, cold fronts bring sudden changes, stationary fronts bring prolonged cloudy and rainy weather, and occluded fronts bring complex weather patterns.
Step-by-step explanation:
The four types of fronts are warm fronts, cold fronts, stationary fronts, and occluded fronts. Fronts form when air masses with different temperature and moisture characteristics collide. Warm fronts occur when a warm air mass replaces a cold air mass, and they lead to gradual weather changes such as increasing cloudiness and precipitation. Cold fronts occur when a cold air mass replaces a warm air mass, and they lead to more sudden weather changes such as thunderstorms. Stationary fronts occur when two air masses meet but neither moves, leading to prolonged periods of cloudy and rainy weather. Occluded fronts occur when a cold front overtakes a warm front, leading to complex weather patterns including precipitation and changing wind directions.