Use the physical map of the United States on pages 68 and 69 of Understanding Geography to answer the question. Which river flows south from the Rocky Mountains to form the U.S. border with Mexico? A. Arkansas River B. Rio Grande C. Snake River D. Colorado River

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Based on the map I searched online, you can narrow it down to either the Colorado or the Rio Grande. I would choose the Rio Grande myself but it's up to you.
Ver imagen TheReaper117
The correct answer is B.   Rio Grande