The Grand Canyon shows superposition because this place shows that the rocks at the bottom are the oldest, and the ones at the top are the youngest. This shows how it is possible to determine the age of the rocks. Superposition is great for the Grand Canyon because it has formed a long time ago. Cross cutting is apart of the Grand Canyon also because it also shows the age of the rocks there in the Grand Canyon. That is how the Grand Canyon demonstrates superposition and cross cutting.