Print out the worksheet on the following page and as ROPOS travels to each of the eight sites on your traverse, use the worksheet to write down your observations about the lava you see and the animal species that are living on it. Try to determine at each site:

* Is there evidence for a recent eruption of lava here?

* Is the lava collapsed or uncollapsed?

* Is there a hydrothermal vent present, and if so, is it old or new?

* What animal species are present and what do they tell you about the age of the lava?

* Finally, what do the clues you see about lava age tell you about what happened to the rumbleometer?