Volcanoes

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Across
  1. 2. type of boundary where plates go in different directions and form volcanoes
  2. 6. particles that range in size from small beads to walnuts
  3. 9. molten rock beneath earths surface
  4. 12. particles produced in volcanic eruptions
  5. 14. produced by the accumulation of fluid basaltic lavas
  6. 15. ejected lava fragments that harden in the air and build this volcano
  7. 16. another name for composite cones
  8. 17. particles larger than 64 millimeters in diameter
Down
  1. 1. when pressure drops enough
  2. 3. a subtance's resistance to flow
  3. 4. volcanic activity that occurs within a plate
  4. 5. a long belt of volcanoes that circles much of the Pacific Ocean
  5. 7. magma outside of the volcano
  6. 8. affect characteristics of lava flow
  7. 10. a steep-walled depression at the summit of volcanoes
  8. 11. a landform made of magma that hardened in the volcano's pipe and later was exposed by erosion
  9. 12. type of basaltic lava that forms relatively smooth skin that wrinkles as lava continues to flow
  10. 13. type of basaltic lava that forms rough, jagged blocks with sharp, spiny projections
  11. 17. when blocks are ejected as glowing lava