Why does lake mead have a white ring?

Answer 1

Lake Mead has a white ring, often referred to as a "bathtub ring," due to the accumulation of minerals and sediment left behind as the water level recedes. This ring is primarily composed of calcium carbonate and other minerals that were once submerged but are now exposed as the lake's water levels have dropped significantly over the years. The visible white color contrasts with the darker rock and soil, marking the historical high water levels of the reservoir. This phenomenon serves as a visual indicator of the ongoing drought conditions and water management challenges in the region.