Ocean's

The ocean's supposed blueness comes entirely from the sky.

Source: tatoeba (758078)

The ocean's blueness comes from the same atmospheric conditions that make the sky blue.

Source: tatoeba (779133)

For over a year the bottle drifted about, now north, now south, as the ocean's currents drove it.

Source: tatoeba (5581069)

A thermocline is the transition layer between warmer mixed water at the ocean's surface and cooler deep water below.

Source: tatoeba (6692528)