An Air Mass is a large body of air that has similar temperature, humidity, and air pressure.
There are four different types of Air Masses known as Continental Polar, Continental Tropical, Maritime Polar, and Maritime Tropical.
Continental Polar Air Masses Form over land in Canada and Alaska, and they are dry and cool.
Continental Tropical Air Masses form over dry land in Southwest and Northern Mexico, which causes them to be dry and warm.
Maritime Polar Air Masses form over the North Pacific and North Atlantic Oceans. This climate makes them cold and moist.
Maritime Tropical Air Masses form over Oceans near the Tropics, which gives them warm and moist weather.
Air Masses are connected to fronts because when two or more different Air Masses meet, they can form a front.