Figure 3. View to southeast of Mount St. Helens’ crater. A whaleback-shaped extrusion (part of the new lava dome) emerges from the ground and moves southward (arrow). As it grows southward its edges fracture and crumble, creating a broad apron of blocky debris, over which the extrusion continues to move. Note how the glacier to east is being squeezed and fractured by the growing lava dome. (USGS photo, February 22, 2005)