Using the metric ruler, measure the diameters of some of the particles you just used. Compute an average diameter of the particles and record this size in the table below. Repeat steps 2 - 4 with the other two kinds of particles and record the information in the table. Make a graph of particle size versus the angle of repose. Write a statement that compares particle size to angle of repose.
Cinder cones tend to be steepest near the vent, and less steep at the outer edge.
In other words, the angle of repose is greater at the vent, and less at the edges. Explain why or why not. Kind of Particle Angle of Repose Average Particle Size Go to Piles of Fire Teacher pages. Return to Volcanology Activity Index. Return to Hands-On Activities home page.