Physical map for the western U.S. labelled, Western United States map. The map includes the Mississippi River on the eastern side of the map and the Pacific Ocean on the western side of the map.The Rocky Mountains run through the center of the western part of the map. West of the Rocky Mountains the area is brown. East of the Rocky Mountains the area is green. Unlabled rivers run through the entire map.
Using the map, which sentence correctly compares the middle United States to the western United States?
a) The middle United States has fewer rivers than the western United States.
b) The middle United States could not support as much wildlife as the western United States.
c) The middle United States has fewer changes in elevation than the western United States.
d) The middle United States has more rapid changes in temperature than the western United States.