Final answer:
On a clear day, bodies of water appear blue because they reflect the blue light from the sky.
Step-by-step explanation:
On a clear day, bodies of water appear blue.
This is because water reflects the light from the sky, and on a clear day, the sky appears blue due to the scattering of sunlight. Sunlight consists of different colors of light, and when it interacts with the molecules in Earth's atmosphere, the blue colors scatter more efficiently than the other colors. As a result, the blue light is scattered and reflected by the water, making it appear blue to our eyes.
This phenomenon is similar to why the sky appears blue.