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<p>latitudes over the land or ocean, are very stable, and generally shallower than Arctic air. Polar air over the ocean (maritime) loses its stability as it gains moisture over warmer ocean waters.</p>

<p><big>Movement and fronts</big></p>
<p>A <b>weather front</b> is a boundary separating two masses of air of different <a href="page.php?w=density">densities</a>, and is the principal cause of <a href="page.php?w=meteorological_phenomenon">meteorological phenomena</a>. In <a href="page.php?w=surface_weather_analysis">surface weather analyses</a>, fronts</p><p>
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