4 Causes materials to be ejected onto earth's surface and into atmosphere. (8)
  5 A slowly moving river of ice. (7)
  7 Often called jungle. (10)
10 A ........ volcano is one that consists of two or more vents. (8)
11 Pointed cones of rock, they sometimes grow from the ceiling in caves. (11)
12 A steep volcanic cone built by lava flows and loose fragmented materials. (9)

  1   Word used to describe a volcano which is inactive but may erupt again. (7)
  2 A person who studies volcanoes and volcanic activity. (13)
  3 Very fierce tropical storm with strong winds. (9)
  6 Temporarily move people awas from possible danger. (8)
  8 These cones of rock sometimes grow upwards from the ground inside caves. (11)
  9 Streams of flowing water in the oceans that affect the movement of ships. (8)