Volcanoes

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