Water reaches its maximum density at:
A0 degrees Celsius
B10 degrees Celsius
C20 degrees Celsius
D4 degrees Celsius
Answer & Solution
Correct answer: D. 4 degrees Celsius
1. The density of water does not simply fall as it warms.
2. Water is densest at 4 degrees Celsius, therefore the deepest water in a lake is also the densest.
3. Turnover occurs because water has a maximum density at 4 degrees Celsius.
4. That anomaly is why ice floats and lakes do not freeze solid from the bottom.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 35 'Ecology and the Biosphere', sections 35.1-35.5_
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