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A boundary between a cold polar air mass and a warm subtropical air mass with no horizontal movement is called…

  • A

    Warm front.

  • B

    Stationary front.

  • C

    Occluded front.

  • D

    Cold front.

Refer to figure.
A Stationary front forms when a cold front or warm front stops moving. This happens when two masses of air are pushing against each other but neither is powerful enough to move the other. The situation can be described as winds blowing parallel to the front instead of perpendicular can help it stay in place.

Since there is little frontal movement, weather conditions are likely to be comparatively quiet, though longer lasting.

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