ANSWER:
What changes the water temperature?
" SUNLIGHT "
> Heat transfer, whether from the air, sunlight, another water source or thermal pollution can change the temperature of water. Water temperature plays a major role in the quality of aquatic life and habitats.
Why did the temperature of the water change?
> Since water near the surface is less dense than water near the bottom, the water circulates, bringing the solar-heated water of the surface down into the body of water and heating the lower levels... Water below 4°C is lighter than water at 4°C because the water molecules are beginning to form into ice crystals.
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