Why does cold air sink in the presence of warm air?

Warm air, becuase it is less dense than cooler air, rises and cold air sinks back toward the surface. ?

Explanation:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.