Warm air moves over cold air and replaces it.
It is better to say that they form over warm, tropical water.
where it is warm or hot
Yes, the verb to warm is an action verb; the act of warming, an action.
because austrailia has warm weather and warm weather does not cause glaciers to form
Warm seas with a warm air updraft.
A warm front forms.
A warm front forms.
A warm front forms.
"warm" isn't an abbreviation for anything. That's the word.
Tornadoes form better in warm areas. The reason for this is warm air holds more energy to power storms than cold air does.
warm
Warm.