Acold air mass moving into an area occupied by relatively warm air is called a(n):

~Hello there!

Your question: A cold air mass moving into an area occupied by relatively warm air is called a(n): .

Your  A cold air mass moving into an area occupied by relatively warm air is called a(n): .

It is called a cold front!

Any questions?

Happy Studying! 

The correct answer is a)  a resource with a limited supply; it will run out.