The sun warms the Earth. Its rays cannot reach all the way to the bottom of the ocean, and it certainly stops warming the water at a certain distance.
The opposite of bottom would be the top, so the oceans surface is the opposite of the ocean floor/bottom.
A seamount is an underwater volcano that rises from the ocean floor but does not reach the surface of the water. Seamounts are common features on the ocean floor and can vary in size and shape. They are usually formed by volcanic activity and can be found in all of the world's oceans.
Earth's crust is composed of the continents and the ocean floor.
This section of the ocean from floor to surface is called the water column.
The ocean's surface
The ocean is 71% of the Earth's Surface.
oceans and seas
Pressure increases as you approach the ocean floor.
The cooler saltier water sinks toward the ocean floor.
The temperature of the ocean at the surface is not constant across all oceans. For example, the Arctic Ocean will have a much colder surface temperature than the Pacific.
Plankton
Wind causing waves are formed at the surface of the oceans.