15.
which ocean layer contains approximately 90% of earth's seawater?

The deep ocean contains 90% of Earth's seawater!

Explanation: The deep ocean is the bottom part of the ocean, while the surface ocean is the uppermost part. These two zones are separated by the thermocline, which is a collection of layers of water where temperatures decrease rapidly the deeper you go. Once you reach the deep ocean (at approximately 1,800 meters and more), temperatures are extremely low!

it would be 2 or b because the clouds are a form of condensation

not completely sure but i think it’s many moons, smaller in size and a ring system.