North America’s western mountains are much _______________ than east coast mountains.
older
younger
This mountain range stopped growing about the time the Rockies were forming.
Alps
Andes
Himalayas
Appalachian
North America’s western mountains are much _______________ than east coast mountains.
older
younger
This mountain range stopped growing about the time the Rockies were forming.
Alps
Andes
Himalayas
Appalachian