Multiple choice Rich soil to grow wheat, parley, and peas in the Indus Valley resulted from the annual flooding of the Indus River proximity to the Arabian Sea a sophisticated irrigation system importing soil from the Deccan Plateau Reveal answer Fill a bubble to check yourself A Correct answer Explanation Like other river valley civilizations, the Indus Valley relied on the annual flooding of the Indus River to deposit nutrient-rich silt, which made farming highly productive.