Beakman uses a chocolate-covered cherry as a demo of what the layers of the earth look like. He then demonstrates the earth plates by showing a ball with plastic plates glued on it to explain plate techtonics. He creates a simulation of two tectonic plates sliding past each other. He uses two planks side by side connected with sticky paper on top and has bobble heads on each to capture the movement (like a seismograph). They push the plates in opposite directions to demonstrate how an earthquake occurs.
Hannah instructs the group to go down into the chasm, as it may be their only hope out of the cave. Professor Anderson is the first to climb down, and Sean follows but takes much longer, as he is frightened. During the descent, Professor Anderson notices some metamorphic rocks and tells Sean about them. He loses his balance and is put into what he initially thought was a perilous situation.
Trevor, Anna and Sean are stuck inside an active volcano. Their only hope to escape is to start an eruption that will propel them out of the volcano. On his last flare, Trevor finally lights a spark between two igneous rocks in the wall to begin the eruption.