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Volcano's Deadly Warning

Anatomy of a Volcano

 

Intro | Ash | Lava flow | Lava dome | Lava | Vent |  Tephra  | Caldera | Lahar | Fissure | Dike | Magma

Volcano's Deadly Warning homepage

Tephra
Diagram of a volcano

Tephra
Tephra is a general term for fragments of volcanic rock and lava that are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains. Tephra includes large, dense blocks and bombs, and small, light rock debris such as scoria, pumice, reticulite, and ash.

Left: A fountain of hot lava and tephra erupts from a crater in Hawaii's Kilauea East Rift in 1983.

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NOVA Home Find out what's coming up on air Listing of previous NOVA Web sites NOVA's history Subscribe to the NOVA bulletin Lesson plans and more for teachers NOVA RSS feeds Tell us what you think Program transcripts Buy NOVA videos or DVDs Watch NOVA programs online Answers to frequently asked questions