It does.
No, Earth is not the only planet with lava (magma), Venus has a molten core as well as Earth.
The Lava spring is in an new area called area 2 on the planet of genshi, once you get into the area run around every time you see a dead end turn around. if that dead end happens to be a river of lava then get close to it to automatically do a trick once you are at the spring do the same trick that happens to every pond or river of lava to the 4 rivers of lava leading to the spring when done the spring will run dry and you will see a stone table walk up to it and claim your prize if you need more info post on my message board.
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Venus.
venus
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.
yes, there is loads of lava on mars. The average temperature is 78 degrees
Venus.
The lava is the first challenge on the Fire Planet (X-83 Y-20), which is up and to the right of the planet Poptropica. (see related question)
The coordinates for the jungle planet are (15,15). Poptropica is (50,50). The ice planet is (73,83). and the lava planet is (83,20).
The FIRE PLANET is at coordinates X-83 Y-20, up and to the right from the planet Poptropica.