Problem
i. Miami Beach is actually a barrier island. Miami Beach has been heavily developed with hotels and condominiums. Speculate on why Miami Beach has had to have its beach sand replenished.
ii. Why isn't the Grand Canyon of the Colorado simply a product of the erosion by the river?
iii. You dig into material in a region you know has been glaciated. Explain how you could tell you are digging into glacial till rather than alluvium.