In the Grand Canyon, for example, one can see the various layers of rock that have been excavated on link canyon walls, and see the evolution of the surface in the area directly. The process of dating surfaces by looking at the relationships between them is called stratigraphy. In addition, with the development of radiometric dating techniques, we can determine when a rock was formed or changed state directly, by measuring the amount of materials produced by radioactive decay within the rock.
This powerful technique has allowed us to determine the absolute ages of all of the surfaces on the Earth, and those surfaces on the Moon from which samples have been returned by the Apollo and Soviet Luna missions.
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