Across
- 4. Magamas that form in different volcanic enviroments have unique chemical compositions
- 6. Are large, steep-sided volcanoes that result from explosive eruptions of andsitic and rhyolitic lava and ash
- 7. Common along divergant plate boundaries and oceanic hot spots
- 8. A vent in earth's crust throught which melted- or molten- rock flows
- 9. When two plates collide, the denser plate sinks or subducts, into the mantel
- 13. The presence of dissolved gasses in magma contributes to how explosive a volcano can be
- 14. Represents an area of earthquakes and volcanic activity that surrounds the pacific ocean
- 15. During an explosive eruption, volcanoes can erupt large volumes of volcanic ash
Down
- 1. Explosive volcanoes can produce fastmoving avalanches of hot gas, ash, and rock called pyroclastic
- 2. Volcanoes that are mot associated with plate boundaries are called hot spots
- 3. When two plates spread apart along a divergant boundry.
- 5. The thermal energy a volcano produces during an eruption can melt snow and ice on the summit
- 10. Are small, steep sided volcanoes that erupt gas-rich, basaltic lavas
- 11. Large volcanic depression formed when a vcolcano's summit collapses or is blown away by explosive activity
- 12. Lava flows are relatively slow moving, they are rarely deadly