The Great Canyon is formed by

1. River Mississippi
2. River ohio
3. River Colorado
4. River St. Lawrence

The river that rises in the Rockies and flows into the Gulf of California

1. Colorado
2. Mississippi
3. St. Lawrence
4. Mack

The country not a part of Central America

1. Mexico
2. Costa Rica
3. Panama
4. Belize

The major drainage system of North America with river Ohio as its major tributary

1. Mississippi
2. Colorado
3. St. Lawrence
4. Mackenzie