The law that describes a layer of the Grand Canyon that is older than the layer above it is the law of superposition.
The correct answer is the "law of superposition." This law is a basic principle of geology that states that in any undisturbed sequence of rock layers, the oldest rocks are located at the bottom, and the youngest rocks are at the top. So, when examining the layers of the Grand Canyon, if a layer is found below another layer, it is automatically older than the layer above it. This is why the law of superposition describes the relationship between layers in the Grand Canyon, and helps determine their relative ages.
