In the formula Ca₂SO₄, the subscript 2 means that the formula contains

In short, the subscribt just tells you how many molecules that this compound contains. The "2" indicates that there are 2 molecules of calcium, while the "SO4" represents a sulfate ion.

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.