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CLEAN : Royal expert: Prince Harry and Meghan's step back is unprecedented
Royal expert Victoria Murphy says that there is no precedent for Prince Harry and Meghan's step back from 'senior royal duties (Footage by AFPTV via Getty Images)
Khan Academy
Plate Tectonics: Geological Features of Divergent Plate Boundaries
Sal explains the mechanism of crust lift developing at hot spots. The density changes at that point, continuing to cause depressions. The depressions and thinner layers fill with water, resulting in a flooded rift valley.