A black and white diagram showing how magma forms a cone. A gray, cone-shaped figure, labeled bulge, is in the center of the picture. Inside of the bulge, is a darker pipe-shapped figure, magma, with the bowl of the pipe near the widest part of the cone and the stem of the pipe is downward to the lower edge of the picture. The magma pushes up the cone.

|| Return to lesson 2 ||