earth & environmental science HSC / hazards

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Across
  1. 2. , the volcanic __________ index is a scale that rates a volcano’s destructiveness and explosive power based on the amount of matter it ejects during an eruption
  2. 6. flow , the rapid flow of ash and gases down the side of the volcano during an explosive eruption
  3. 9. , ___________ volcanism is volcanic activity associated with subduction zones, where subducted crust is melted and mixed with silicate minerals
  4. 11. the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
  5. 12. arc , a string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate
  6. 13. , a ___________ boundary is where 2 plates move towards eachother
Down
  1. 1. , an __________ eruption is a violent and unpredictable eruption - the result of magma that is thicker and more viscous
  2. 3. , a liquids resistance to flow
  3. 4. , the point on the earth’s surface directly above the focus of an earthquake
  4. 5. , an avalanche of volcanic water and mud down the slopes of a volcano
  5. 7. , the point beneath earth’s surface where rock breaks under stress and cause an earthquake
  6. 8. , an ___________ eruption is a type of volcanic eruption in which lava steadily flows out of a volcano onto the ground - the result of magma is thinner and less viscous
  7. 10. , extremely deep areas in the ocean that are created by a subducting plate