Which principle if relative dating is the most important? why?

The relative ages of rocks are important for understanding Earth's history. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface.

Explanation:

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49

landlessness of ordinary people

^^something like that^^^