Warm-up Look back over the worksheet from yesterday and the foldable organizer on the 4 types of volcanoes we discussed. – Stratovolcano, cinder cone, shield, and caldera

– Rank the four types in order of least explosive to most explosive

Least Explosive Most Explosive

– Rank the four types in order of least explosive to most explosive Least Explosive Most Explosive Shield

– Rank the four types in order of least explosive to most explosive Least Explosive Most Explosive Shield Cinder

– Rank the four types in order of least explosive to most explosive Least Explosive Most Explosive Shield Cinder Strato

– Rank the four types in order of least explosive to most explosive Least Explosive Most Explosive Shield Cinder Strato Caldera

Review of stations Stratovolcano: Formed around subduction zones Built up by layers of tephra, lava, and pyroclastic materials High viscosity magma Cinder Cone: Relatively smaller as can be found on other volcanoes Built up of blocks, cinders, and other rocky material erupted

Review of stations Shield Caldera Wide base with gentle slope Think Hawaii Low viscosity magma Think Yellowstone Created when large amounts of magma is ejected quickly- large eruptions High viscosity magma

2 nd Model Create a list of the activities we have done so far about volcanoes – What have we learned that can help us understand why Mt St Helens erupted explosively?

2 nd Model In your table groups, you will be drawing a second model, making sure to incorporate what we have learned over the last week as it relates to explosive eruptions

Exit Ticket Individually- write down on a separate piece of paper how your groups model changed. What have you learned so far about the causes of explosive volcanic eruptions?