A superball is a high bounce ball. Ralph, who is 10, is playing with one in the dining room. He bounces the ball and knocks a vase off a table. His mother, hears the crash and running into the room, grabs the ball and sticks it in the freezer for a couple of hours before giving the ball back to Ralph. Ralph tries bouncing it again, but it's lost its bounce. What happened? What material property was Ralph's Mum using?

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