The diagram below shows the layers of rock that make up the Grand Canyon. What does the law of superposition say about how the Grand Canyon has changed over time? A. The Grand Canyon was once underwater because the newest rocks are found at the bottom-most layers.
B. The Grand Canyon divided into layers of different rocks because of cracks that arose from volcanic eruptions.
C. The Kaibab Limestone used to be underground but was elevated as the layer pushed upward through Earth’s crust.
D. The top layer may once have been Redwall Limestone, but over time sediment continued to build up and now Kaibab Limestone is the top layer.