Answer:
The principle of superposition
Explanation:
The principle of superposition tells you how rock layers are laid.
Oceans, rivers, valleys, mountains, plains, hills and glaciers are some examples.
Where is the map my friend..
Thanks!
It changed so much because there were always European explorers heading out on voyages, for many reasons (like to trade with neighbouring countries, ferrying people from one land to the other, etc). During those voyages they found new lands, and so the maps had to be revised quite often because of these new discoveries.
