Layers of volcanic materials that build up around vent to form a cone-shaped structure are known as –

  • Crater
  • Vent
  • Cone
  • None of the above
  • Cone

Eruptions of composite volcanoes are loud and violent because that contain –

  • basic lava
  • viscous composite lava
  • viscous acid lava
  • none of the above
  • viscous acid lava

This is the scale used to measure the size of volcanic eruptions –

  • Richter Scale
  • Volcanic Explosivity Index
  • Volcano Eruptivity Scale
  • None of the above
  • Volcanic Explosivity Index