I am a sixth grade science teacher:
Why do scientists think the Grand Canyon was once covered by an ocean?(1 point)
Responses

The sedimentary rock type forming layers of the canyon formed under the sea.
The sedimentary rock type forming layers of the canyon formed under the sea.

Seawater has been found seeping up through the canyon floor.
Seawater has been found seeping up through the canyon floor.

Only an ocean would have the strength to erode the rock forming the Grand Canyon.
Only an ocean would have the strength to erode the rock forming the Grand Canyon.

The Grand Canyon is located along coastlines that likely flooded.