answersLogoWhite

0


Best Answer

The Nasca plate drove under the Pacific plate.

User Avatar

Wiki User

16y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

12y ago

The Pacific Plate subducted under the North American Plate in the Mesozoic Era. Glaciers eroded mountains and valleys, forming rolling hills.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How did the western cordillera form?
Write your answer...
Submit
Still have questions?
magnify glass
imp