Which of the following statements with regard to western North American river boundaries is/are correct? 1. The Colorado River carves through the Colorado Plateau to form the Grand Canyon before emptying into Lake Mead along the Arizona-Nevada border. 2. The Rio Grande serves as a fixed, unshifting international boundary between the United States and Mexico, free from bilateral territorial disputes. Select the answer using the code given below: |ForumIAS

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: A

Notes:

Explanation:

Statement 1 is correct: The Colorado River is the primary force that carved the Grand Canyon. It flows southwestward and fills the massive Hoover Dam reservoir (Lake Mead) on the Nevada-Arizona line.
Statement 2 is incorrect: The Rio Grande is notorious for shifting its river channel due to natural avulsion and flooding. These shifts historically caused frequent boundary disputes between the US and Mexico (such as the Chamizal dispute).