What are the different colored horizontal layers that we see in this photo of a wall in the Grand Canyon?

A) They are sediments deposited at different times in the past, so that layers near the bottom are the oldest and layers near the top are the youngest.
B) They are different types of volcanic rock that cooled at different rates after a single, large volcanic eruption.
C) They formed as the Colorado River carved out the canyon, so that the layers near the top are the oldest and the layers at the bottom are the youngest.
D) They got their coloration from ancient civilizations that painted the rock.


A) They are sediments deposited at different times in the past, so that layers near the bottom are the oldest and layers near the top are the youngest.

Physics & Space Science

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