HELP ASAP you have to match the term and the definition
(this is science)

1: When a cold air mass and a warm air mass meet but are at a standstill, the boundary is called?

2: If warm or more humid air presses forward and colder or drier air draws back, the boundary is called?

3: If colder or drier air presses forward and warmer or more humid air draws back, the boundary is called?

4: sometimes a warm air mass can get caught between two cold fronts, which can force the warm air up into a wedge shape.