The lake became clear.

Winter is cold, the water surface freezes, microbial activities are relatively slow or stop, organic matter is rarely produced, and impurities are precipitated. Just in spring, the ice and snow melt and pure melt water is injected; In addition, the temperature is low, and the biological activities such as microorganisms are relatively low, so it is clear. In the middle and late summer solstice and autumn, microbial activities increase, algae and other plants in the water grow and rot, and the water naturally becomes turbid. If you don't believe me, you can go to see it at the end of summer. The water quality must be as turbid as last year.