When a warm air mass and a cold air mass stall next to each other it’s called a(n) front.

cold
occluded
stationary
warm

stationary

Explanation:

It's called a stationary front because the gases remain stationary next to each other because neither is strong enough to replace another.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.