Lava Flow types: Aa and Pahoehoe

I show this video during my unit on volcanoes when discussing the two Hawaiian volcano flow types, Pahoehoe and aa lavas.  It shows both very well and I have the students shout out what type as the video plays.  There is also a great view as to what a shield volcano looks like so I pause it at that point to discuss why a shield volcano takes on the shape that it does.  I also talk about the cooling of the lava and how it hardens and turns into solid basalt.

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