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when you melt glass, the glass changes from a solid to a liquid. when the heat source is removed and the melted glass is allowed to cool, it changes back into a solid.
the transfer of energy caused a change to the of glass.
a.) physical properties
b.) internal properties
c.) chemical properties

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.