Amass of cold, dry air is a mass of warm, humid air. consequently, warmer (lighter) air is often forced to rise above the sloping frontal surface overlying colder (denser) air.

A mass of cold, dry air is lighter than a mass of warm,humid air.
The lighter warm air slides up and over the cold air. wWarmer (lighter) air is often forced to rise above the sloping frontal surface overlying colder (denser) air. There is a boundary separating two masses of air of different densities.The air masses separated by a front usually differ in temperature and humidity.

This is what i found on google “what happens to the bond angle when you add or remove an electron domain? the bond angle decreases as you add domains 5. can you force the atoms into new configurations by pushing atoms around? note: we can think of a bond or a lone pair of electrons as a “domain” of electrons.” i hope this you