Explores volcanic rocks, explaining what they are, types of lava, and cooling off; and describing basalt, obsidian, pumice, and other specimens. Includes glossary and a list of related Internet sites.
General Note
Includes index.
Content Note
What are volcanic rocks? -- Volcanoes -- Types of lava -- Cooling off -- Basalt -- Obsidian -- Pumice -- Other volcanic rocks -- Volcanic islands -- Always changing.