__A__ 1. Rugged mountains located along the Pacific Coast that stretch from Canada to California.
__H__ 2. Found along the Atlantic Coast and Gulf of Mexico.
__F__ 3. Wrapped around the Hudson Bay in a horseshoe shape.
__D__ 4. Located west of the Interior Lowlands and east of the Rocky Mountains.
__B__ 5. The Blue Ridge Mountains are part of this region which is east of the Interior Lowlands.
__C__ 6. Located west of the Great Plains and provide the tallest mountains in the United States.
__B__ 7. Contains the oldest mountain range in the United States, west of the Coastal Plain.
__E__ 8. Rolling flat land with many rivers including a large part of the Mississippi River and found east of the Great Plains.
__G__ 9. Contains Death Valley and is east of the Sierra Nevada and Cascade Mountains.
__C__10. Contains the Continental Divide which determines the directional flow of rivers. (It ranges from Alaska to Mexico with high elevations.)