Question

Which describes the Grand Canyon as it will be one million years from today? Select the two correct answers.(2 points)
Responses

It will become shallower, as the Colorado River deposits sediment in the canyon.
It will become shallower, as the Colorado River deposits sediment in the canyon.

It will become narrower, as weathered rock collects at the canyon’s edges
It will become narrower, as weathered rock collects at the canyon’s edges

It will become wider, as the edges of the canyon are weathered and eroded.
It will become wider, as the edges of the canyon are weathered and eroded.

It will become deeper, as the Colorado River continues to carve into the rock.

Answer 1

Correct choices:

- It will become wider, as the edges of the canyon are weathered and eroded.
- It will become deeper, as the Colorado River continues to carve into the rock.

Explanation: Weathering and mass wasting cause the canyon walls to retreat (widening), while the river continues to downcut into bedrock (deepening). Sediment deposition does occur locally but does not make the overall canyon shallower or narrower over long time scales.