Here's why:
* Igneous rock forms from the cooling and solidification of molten rock (magma or lava).
* Sedimentary rock forms from the accumulation and cementation of sediments, like sand, mud, or the remains of organisms.
The layers of rock in the Grand Canyon were formed over millions of years as sediments were deposited in a shallow sea. These layers were then uplifted and eroded, revealing the stunning canyon we see today.
While there are some igneous intrusions within the Grand Canyon, these are relatively small compared to the vast expanse of sedimentary rock.
