| Summary |
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| • | When
two air masses meet, a front is created. |
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| • | There
are four kinds of fronts: |
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| – | Stationary
– not moving |
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| – | Cold
– cold air replaces warm air |
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| – | Warm
– warm air replaces cold air |
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| – | Occluded
– cold front catches up with warm front |
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