http://faculty.chemeketa.edu/afrank1/topo_maps/scale.htm use this website and i think this should fully explain it
Because the climate can change and get hotter? idk
Answer:Geographic featured that acted as norther borders of the Roman Empire at its height were: Rhine River, Danube River, Carpathian Mountains, and the Black Sea.
Acid rain threatens the world's food supply.
Acid rain is a global issue.
