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Fronts
the boundaries between air masses
A front is defined as the transition zone between two
air masses of different density.
Fronts extend not only in the horizontal direction,
but in the vertical as well. Therefore, when referring to the
frontal surface (or frontal zone), we referring to both the horizontal
and vertical components of the front.
[Image: cross section of cold front (27K)]
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![[Image: cross section of cold front (27K)]](/guides/mtr/af/frnts/gifs/home.gif){kind=link}