What causes the ocean to appear different colours?

The ocean appears different colours due to the scattering of light and the presence of particles or organisms. In deep, clear water, blue wavelengths dominate because they scatter more than red or green. In coastal areas, algae and sediment can make the water appear green, brown, or murky. Phytoplankton blooms can give the ocean vibrant green or red hues, highlighting the dynamic interplay of light and marine life.