Where is the exit from Volcania?

Hint 1 of 7:

You're going to have to use the volcano to propel you out.

Hint 2 of 7:

If it's under enough pressure, it will erupt.

Hint 3 of 7:

Those vents are the only way the volcano's pressure stays down.

Hint 4 of 7:

So cover them with the heavy rocks.

Hint 5 of 7:

There are a total of four vents.  Once you've covered them all, you should
head for a place that looks fairly unstable.

Hint 6 of 7:

The mound on the triceratops screen will probably blow.