Billy and juan were out hiking. they crossed the train tracks and all of a sudden juan shouted: "i think i hear a train! " "i can tell you for sure if a train is coming," said billy. what did billy do? a) he put his ear to the train track. b) he cupped his ear with his hand. c) he closed his eyes and listened. d) he stuck his head underwater.

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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.