An ice rink or an ice skating rink is a frozen body of water where people can skate or play different types of winter sports. Some of the other functions of a rink are playing ice hockey, figure skating, curling, exhibitions and contests, and ice shows. In Sullivan there are two types of rinks available, one is natural, where freezing occurs due to cold temperatures, and the other is artificial or mechanically-frozen, where a coolant produces cold in the surface below the water of the rink, causing it to freeze. In certain cases, rinks use synthetic ice where skating surfaces are made out of plastics.