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Enter in the box the number corresponding to the right answer Which river forms a natural border between the US and Mexico?     1 Rio Grande How many islands constitute the Hawaiian chain?     2 about 130 In which state is the Grand Canyon located?     3 Appalachian Mountains Which are the oldest mountains in North America?     4 John F. Kennedy Airport What is the name of the main International Airport at New York?     5 Arizona

 
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