Volcanic Bombs

Part of Hall of Planet Earth.

volcanic bombs HERO

Volcanic bombs form during many eruptions. The patinas of reddish brown or bluish iridescence formed when the bombs’ outer layer reacted with the oxygen in the atmosphere.

In This Section

Exhibit Spindle bomb A molten blob of magma twisted through the air, stretching and bending itself into this formation, known as a spindle bomb. Exhibit Cored bomb This bomb formed around a nugget of chilled rock. Exhibit Bread crust bomb This bomb’s exterior is filled with gas bubbles. Exhibit Cannonball bomb When the bomb and hurtles down the slope its corners become sheared and its form appears as a smooth, rounded lump.