The primary color of the ocean is blue, which is primarily due to the absorption and scattering of sunlight by water. Water absorbs colors in the red part of the light spectrum and reflects and scatters the blue part. As a result, oceans and large bodies of water appear blue to our eyes, particularly in deep, clear waters. However, the color can change due to various factors, such as phytoplankton blooms, sediment, and the presence of organic materials, which may alter its appearance to shades of green or brown.