Why is the colour of sea blue?

The sea appears blue because water absorbs longer wavelengths of light, such as red, orange, and yellow, while scattering shorter blue wavelengths back to our eyes. Sunlight plays a major role, as the reflection of the sky also enhances the blue appearance of the ocean. In deep and clear waters, this effect becomes even more noticeable. Factors like water depth, algae, and sediments can sometimes change the sea’s color to green or turquoise. Scientists explain that the interaction between sunlight and water molecules is the main reason behind the sea’s beautiful blue shade. Just as understanding natural science is important, creating an engaging online presence is essential for businesses.

The oceans are actually blue because of what's called a "scattering effect". Basically, the shorter waves that we see as blue have to bounce off more molecules of water before they reach our eye. They scatter many times before they get to us, and eventually they come back a deeper blue. This is where I'm going to start to get a little more technical. Water does absorb some of the scattered light from the sun, so as we get deeper into the ocean, less light reaches us.