LOS ANGELES, July 8 (Xinhua) -- Surrounded by a white band of dried rocks, the vast drop in water levels is visible this week at Lake Mead, the biggest reservoir in the United States, which has been shrinking amid a two-decade-long megadrought.
The "bathtub ring" around the drought-stricken lake, on the Arizona-Nevada border and over 40 kilometers east of Las Vegas, is made of minerals deposited on the rock walls when the lake's water level was higher.
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