How do you get to Ridley in Super metroid?

To get Ridley you need to get to the bottom of Norfair with the Speed Booster. I lent my game to a friend so this may be inaccurate. Sry. Oh and if Draydon is reading this remember where Wild world is... I cut the string and no more Drydon or Alana or your AR cash... You remember that...