Write a short paragraph explaining why fish live through cold winters even when the ponds are frozen over
What will be an ideal response?
Water has its greatest density at 4°C. And water in a lake that reaches 4°C sinks to the bottom, just as anything else denser than water will sink in water. So the bottom of a lake in cold climates is usually 4°C. Since water is a poor conductor of heat, the 4°C water remains so year-round unless the lake is shallow and summer temperatures high. Fish survive in cold winters in this 4°C water. Only in shallow waters will freezing be complete to the bottom. Then fish are in trouble!
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What will be an ideal response?
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