It seems like a Creationist mentions the Grand Canyon at least once in every flood thread. Why is this? There are bigger canyons in the world, look at the Mariana Trench; it is over five miles deeper at 35,000 feet. With the Grand Canyon, one can explain its creation with “rapid” erosion from the Colorado River. The Mariana Trench however relays on plate tectonics for explanation. Even Mount Everest’s growth over 4mm a year could theoretically be used by Creationists in support for their “cork Earth” theories where the surface is bobbing up and down on a giant subterranean ocean.