Center - Operating up and down the middle of the ice, the center usually leads the attack for his team. He is the playmaker, passing between his two wings to set up a goal. Defensively, he tries to keep the puck in the attacking zone by breaking up a play before it gets to his team's side of the ice. Offensively, they work with the center on the attack to set up shots on goal. Defensively, they try to disrupt playmaking by the opposing team's wings.
Water is sprayed over a concrete floor that has freezing pipes imbedded in it.
It's the name of the machine that cleans the ice between periods. The zamboni scrapes off the loose shavings and lays down a layer of hot water that welds a smooth sheet of new ice to the playing surface. The puck is 6 oz. of solid vulcanized rubber, three inches in diameter and one inch thick. It is frozen before use to prevent it from bouncing on the ice. Some slapshots travel up to 100 mph.