Consider a Lake That Is Uniformly 10°C

Multiple Choice

Consider a lake that is uniformly 10°C. What happens to the oxygen-rich surface water as it cools down to ?

A) The oxygen gets squeezed out as the microcrystals form.
B) Its rate of evaporation decreases which has the effect of increasing the oxygen concentration.
C) It grows less dense and remains at the surface.
D) It grows more dense and sinks towards the bottom.