十万个为什么·科学阅读30篇（3）
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Why Do Some Lakes Change Color Seasonally?
为什么有些湖泊会随季节变换颜色？
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Certain lakes turn pink, green, or red during warm summer months.
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Tiny microbes called archaea and algae grow fast in salty, sunny water.
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They make pigments like beta-carotene to protect themselves from strong sunlight.
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Wind and rain mix the water, spreading color evenly across the lake surface.
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In winter, cold temperatures slow growth and the lake looks clear or gray.
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Scientists monitor these color shifts to track climate and ecosystem health.
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One famous example is Lake Hillier in Australia — pink all year round.
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The color is harmless and comes only from natural living organisms.