This activity (located on page 3 of the PDF under GPS: Lava Flow Activity) is a full inquiry investigation into the relationship between an object’s mass and the distance it is thrown by a catapult. Groups of learners will assemble a simple plastic spoon catapult and test launch “tephra” (material ejected from volcanoes) of different masses, calculate average throwing distance and graph their recorded results. Relates to linked video, DragonflyTV GPS: Lava Flow.