Volcano! One of the Mightiest Forces on Earth.

Volcano! Apart from the impact of an asteroid, an explosive eruption of a volcano releases more energy above ground in a small region than any other natural event!

This study presents colorful samples of the rock and ash types produced in volcanic eruptions around the world. The 6-sample boxed set comes with an in-depth information sheet and keyed index to identify samples.

Also, see smaller version of this set: Volcano!....#JPT-189.