Because hot air is less heavy cold air is more heavy causing them to shift if cold air is placed on top.
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river is the right answer</h3>
REAL NAME - SHRESTH DUBEY
<span>A topographic map is the best tool for this purpose.
In addition to being used for directional navigation, topographic maps also give the user a means by which to understand elevation in the area they climbing. These maps include topographic lines where each line represents an elevation and the distance between lines can be used to determine the terrain profile.</span>
The Han Chinese are the ethnic majority in China<span />
