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<a accesskey="3" href="page.php?w=weather_front&amp;p=2">3.Next</a>
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<p>A <b>weather front</b> is a boundary separating <a href="page.php?w=air_mass">air mass</a>es for which several characteristics differ, such as <a href="page.php?w=Density_of_air">air density</a>, <a href="page.php?w=wind">wind</a>, <a href="page.php?w=temperature">temperature</a>, and <a href="page.php?w=humidity">humidity</a>. Disturbed and unstable weather due to these differences often arises along the boundary. For instance, <a href="page.php?w=cold_front">cold front</a>s can bring bands of <a href="page.php?w=thunderstorm">thunderstorm</a>s</p><p>
<a accesskey="3" href="page.php?w=weather_front&amp;p=2">3.Next</a>
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