"A rumble deep inside Earth. Hot, flowing magma is trapped and needs a way to escape. Pressure builds and causes a break in the surface. Eruption! Volcanic eruptions can shoot lava, ash, and smoke over a huge area. Why do they happen? Learn about volcanoes, what causes them, and how to be prepared."-- Provided by publisher.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.