Across
- 4. rich in dark silicates
- 7. steep-walled depression at the summit, less than 1k in diameter
- 10. hardened or cooled lava
- 12. Largest historic eruption in North America
- 14. resembles a twisted or ropey texture
- 15. ___ and dust: fine, glassy fragments
Down
- 1. Began in 1983, the most recent of at least 50 eruptive phases
- 2. hot red comes out of Volcanoes
- 3. the resistance to flow
- 5. walnut-sized material
- 6. rich in light silicates
- 8. porous rock from “frothy” lava
- 9. Source Material for Volcanic Eruptions
- 11. pea-sized material
- 13. ejected as hot lava