When a warm air mass moves into an area where a cold air mass is located, it is called a(n)

It is called a warm front when a warm air mass moves into an area where a cold air mass is located based on the blanked sentence above. A warm front is a condition where a warm air mass is replacing a cold air in a place. The character of a warm front condition is an increasing in temperature of a place which is caused by the moving warm air mass.

No it doesnt because it can be any number.