十万个为什么·科学阅读30篇(5)
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Why Do Some Lakes Change Color Seasonally?
为什么有些湖泊会随季节改变颜色?
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Certain lakes turn pink, red, or green during warm months.某些湖泊在温暖季节会变成粉红色、红色或绿色。
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Tiny algae and bacteria thrive in salty or alkaline water.微小的藻类和细菌在咸水或碱性水中繁盛。
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They produce pigments like beta-carotene for sun protection.它们产生β-胡萝卜素等色素以抵御阳光。
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Wind and temperature changes bring nutrients to the surface.风力和温度变化将养分带到水面。
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More nutrients mean more colorful microbes bloom.养分增多,导致更多彩色微生物大量繁殖。
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In winter, cold temperatures slow microbial activity.冬季低温会减缓微生物活动。
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The lake then looks clear or blue again.此时湖泊再次变得清澈或呈蓝色。
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Scientists study these lakes to learn about ancient Earth environments.科学家研究这些湖泊以了解古代地球环境。