Pure water is actually colorless. When we think of water, we often associate it with the color blue because of the way it appears in large bodies such as oceans, lakes, and rivers. However, this is not the true color of water itself. Water is a transparent substance, meaning it does not absorb or reflect any specific wavelengths of light.

Water and its color:

- Water molecules are made up of two hydrogen atoms and one oxygen atom. These molecules are arranged in a way that allows light to pass through them without being absorbed or reflected. As a result, water appears colorless to the human eye.

The color of water in different environments:

- The color of water can vary based on its surroundings. For example, when water is in a large body like an ocean or a lake, it can appear blue or green. This is because water can absorb and scatter light, especially in the blue and green parts of the spectrum. As a result, these wavelengths are reflected back to our eyes, giving the water a blue or greenish tint.

- In smaller quantities, such as a glass of water, water appears colorless because there is less light scattering and absorption happening. The water simply reflects the color of its surroundings or any impurities that may be present.

- In nature, water can also appear colorless when it is in the form of rain or a waterfall. This is because the water droplets are small and scattered, allowing light to pass through them without significant absorption or scattering.

Conclusion:

In conclusion, the correct answer to the question "What is the color of pure water?" is option D, None of these. Pure water is actually colorless, but it can appear blue or green in large bodies due to the scattering and absorption of light.

D