[1. If you found a very young rock at the bottom of the Grand Canyon, what would be the most likely way that it got there? ®](AThe rock was uplifted from below.) (C The rock was from a glacier.) (B The rock fell from the cliff above,)(D Animals brought the rock there.) [2. Over time, erosion and weathering can cause canyons to become] (A deeper and narrower)B deeper and wider) (C wider and shallower) (D shallower and narrower)

Summarize how Glen Canyon Dam has
affected the Grand Canyon ecosystem.

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