Answer:
The First one is Typhoon Lagoon which opened on June 1, 1989 and is home to the world's largest outdoor wave pool. The theme of the park is the "Disney legend" of a typhoon that wreaked havoc upon a formerly pristine tropical paradise.
The Second on is Blizzard Beach which opened on April 1, 1996 and was the third WDW water park after River Country and Typhoon Lagoon. The theme of the park is the "Disney legend" of a freak snowstorm in the area, leading to the construction of Florida's first ski resort. Naturally, the snow didn't last long, leaving behind a collection of waterlogged but snow-less ski jumps and chair lifts. The failed resort was in the process of closing for good when an alligator was seen sliding down a flume and splashing into a pool of water, screaming "Yahoo!" Thus the "ski resort" was reborn as a water park, with the alligator (named "Ice Gator") as mascot.
The third one was called Fort Wilderness River Country or just River Country. On January 20, 2005, The Walt Disney Company announced that River Country would remain closed permanently. No reason was given that I could find.