400
Mr. James was looking at pictures of different mountain ranges in the United States. He was surprised to see that the Appalachian Mountains were smaller and more rounded than the Rocky Mountains, explain why the Appalachian Mountains look old and worn compared to the Rockies:
A) the effect of wind and water caused erosion, wearing away the mountains
B)Too many people and animals traveled across the mountains, causing them to wear away
C)All of the snowfall was so heavy that it weighted down the mountains and caused them to shrink
D)The water that used to cover Earth wore away parts of the mountains
A) the effect of wind and water caused erosion, wearing away the mountains (destructive)