You go to the second last one. go back only one then try to jump on to the last one. then go in.
On poptropica in astro knights how do you jump on the rising lava without falling?
In order to get to the lava planet on Poptropica's Astro Knights, you must fly to the sun. From there, you must fly diagonally in the right direction. You should come across the lava planet.
Jump across the lava on the rocks atop the lava geysers. Jump to the next rock when it goes lower. For the 5th and 6th rocks, jump when they are both headed down, and the rock will fall under you.
When you shoot the dragon in the mouth with the ice arrow a couple of times, he will fall into the lava below him! Then you will be back in your spaceship, click launc and go to the next planet!
When the two rocks are going DOWN you jump. I know it sounds weird, but it actually works. (Actually, I got this from WikiAnswers in the first place.)
You have to jump across the lava geysers, slip past the hot volcanic gusts, jump over the Lava Snake, and find Sir Peleas, who will give you the Ice Arrow. (see related question)
you need to defeat the dragon
the volcano is on the Fire planet (X-83 Y-20). To reach it, jump across the stones on top of the lava geysers. When you reach the last jump, jump when both the 5th and 6th rocks are moving down, and the rock will fall right under you.
On the Fire Planet, you have to jump to the rocks on the lava geysers. On your 4th jump, the next rock is out of sight when you jump, so just make sure it is below you. On the tricky 6th jump, jump when BOTH rocks are heading DOWNWARD.
Just jump on the platforms atop the lava geysers. When you get to the 6th one (the last one), jump when both platforms are MOVING DOWN.
I found this very tricky. The best way is to get your timing PERFECT. Watch tutorials on YouTube of Astro Knights.
The spiky thing (rolling thing, eye creature, eye monster, lava creature, lava snake) can be jumped over when it is unrolled (flat). Wait for it to roll toward you in a loop, then step back as it uncoils. Quickly jump across it to the left.