Norfair is a main area of Planet Zebes. It is made out of a rather stony area (Upper Norfair) and ancient ruins (Lower Norfair).
 First Visit
 Fleeting Visit
You'll just have to visit Norfair for a few minutes for now. The Hi-Jump Boots are few steps behind the lower left gate of the first room, which is quite similar to the first room of Upper Brinstar. Enter the gate, then obtain the Energy Tank. Look for cracking blocks behind the tank, then morph into a ball and head left, then enter the gate.
In the next room, you can shoot the upper part of the column to destroy it. Do a spin jump up over it. Next, pick up the boots. As soon as you're back in the previous room, head upwards, get the Missile Pack and pass through the tunnel using bombs. If you can't open the gate, wait for enemies and kill them. The gate won't open until all enemies in the room are dead.
After leaving the chamber, keep going upwards, then use the elevator.
Your journey continues in Brinstar.