Study the image.

Study the images of two different fronts.Based on arrow movement, why is the front shown in item A different from the front shown in item B?

The images show two different fronts.Which fronts are shown?

What causes air masses to move?
Which kind of weather usually forms over the northwest United States in the summer because of maritime polar air masses?
Study the image of an air mass.

Which front forms widespread clouds, rain, or snow?
Which major type of air mass typically brings cool, dry weather?
Study the image, which describes how rapid changes in weather conditions occur.

How is a warm front different from a cold front?
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