There is a reason that most couples today do not have a significant age difference. Consider that over the last one hundred years, the average age difference between married couples is 3.5 years.
The Colorado River begins in north central Colorado and ends at the Gulf of California. The river is chiefly supplied by snow melting in the Rocky Mountains and passes through seven U.S. states and part of Mexico. Continue Reading.
We know these rock layers were once connected, which is described in the rule of lateral continuity. Finally, the Colorado River cuts through all the layers of sedimentary rock to form the canyon. Based on the principle of cross-cutting relationships, the river must be younger than all of the rock layers that it cuts through.