Volcanic rocks and erosion, the (geo)history of Iguazu Falls [Brazil]

Intro: Well, here goes a very last minute decision, to travel to Brazil. With <2 weeks to go I decided to join up with my sister (who is a video blogger and recorded out trip, you can check it out at http://www.heynadine.com) and her two friends (for the 1st part) and go travel for 3 weeks in Brazil. Now,
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