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21.
Which river forms the border between the United States and Mexico for a significant portion of its length?
Explanation:
22.
What is the world's second-largest ocean?
Explanation:
23.
Which of the following is not one of the Great Lakes of North America?
Explanation:
24.
The Strait of Gibraltar connects the Mediterranean Sea to which body of water?
Explanation:
25.
What is the largest river by discharge volume in South America?
Explanation:
26.
The English Channel separates which two countries?
Explanation:
27.
Which of the following is the world's largest estuary and serves as the outlet for the Mississippi River?
Explanation:
28.
The Caspian Sea is the world's largest inland body of water. Which continent is it located in?
Explanation:
29.
What is the largest freshwater lake by volume in the world?
Explanation:
30.
The Panama Canal was officially opened in which year?