Which of the following statements with regard to the Columbia-Snake Plateau is/are correct? 1. It is a structural flood basalt plateau formed as a direct result of extensive sequential volcanic fissure eruptions. 2. It is bound to the west by the Rocky Mountains and bordered along its eastern margin by the Cascade Range. Select the correct 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:

Detailed Explanation:

Statement 1 is correct: The Columbia Plateau (covering parts of Washington, Oregon, and Idaho) is a premier global example of a Flood Basalt Plateau. It was built up by liquid, low-viscosity basaltic lava flows that flooded the landscape and cooled into thick layers.
Statement 2 is incorrect: The Columbia Plateau is bound to the west by the Cascade Range and to the east by the Rocky Mountains.