Explosive eruptions

• these eruptions occur at ___ ___ ____?

  convergent plate boundaries
• lava type: ____, with a ____ viscosity and ____ temperatures at eruption?

  rhyolitic, high, lower
• style of eruption: violent bursting of ___ ____ when magma reaches _____, these eruptions are ___ ____, and often the ___ and top of the ___ are _____?

  gas bubbles, surface, highly explosive, vent, cone, shattered
• materials erupted?


  gas, dust, ash, lava, bombs , tephra
• frequency: ___ ____ with no _____?

  long periods, activity
• shape of volcano formed: steep-sided ___ ____ or calderas?

  strato volcanoes