Question

The temperature of water at the bottom of a lake whose upper surface has frozen to ice would be around ______________.

• A. $-{10}^{o}C$
• B. $0^{o}C$
• C. $4^{o}C$
• D. $-4^{o}C$

Answer 1

The correct option is A $-{10}^{o}C$

Lake freezes from top down that means the surface of lake first converts into ice because the latent heat of the surface water is removed to the atmosphere around it. That's why the temperature at bottom of the lake is more than the freezing temperature of water.