Volcanoes maybe

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Across
  1. 3. opening through which an eruption takes place
  2. 4. near volcanoes are rich and fertile due to the ash that settles there.
  3. 5. smallest volcano in the world
  4. 7. small pieces of rock and glass that can be carried in the air for many kilometres starts with pyroclastic.
  5. 8. An extremely hot liquid and semi-liquid rock that is located under Earth's surface
  6. 9. broad gently sloping cones constructed of solidified lava flows
Down
  1. 1. loudest sound in the world
  2. 2. large bits of very hot rock blown out of a volcano.
  3. 3. a scientist who studies volcanoes
  4. 6. tallest volcano in the world