Why Is Water at the Bottom of a Temperate Lake

question 24

Multiple Choice

Why is water at the bottom of a temperate lake likely to be close to 4°C year-round?

• A) Cooling water below 4°C requires enormous amounts of energy.
• B) Soil temperatures are close to 4°C for most of the year in temperate regions.
• C) Air temperatures in the temperate zone rarely fall below 4°C.
• D) Water is densest at 4°C.

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