What are the 3 mountain rides in Disney woeld called?

There are actually 4 major mountain rides in Disney World, not 3:

1. Space Mountain: Located in Tomorrowland at Magic Kingdom.

2. Big Thunder Mountain Railroad: Located in Frontierland at Magic Kingdom.

3. Seven Dwarfs Mine Train: Located in Fantasyland at Magic Kingdom.

4. Expedition Everest: Located in Animal Kingdom.

Let me know if you have any other questions!