A swirling vertical funnel that occurs over a body of water is termed a "waterspout."
A small whirlpool is called a vortex. It is a swirling mass of water or air, often created by opposing currents or forces.
The portion of the land mass that extends into the ocean is called the coastline or shoreline.
Maritime Air Mass
it is called a current
A Gulf
shelf
A Gulf
The largest rubbish dump is in the Pacific Ocean stretching from Hawaii to Japan. It is about twice the size of the USA. The dump is a swirling mass of discarded plastic from ships and sea bordering countries.
Unless you can find both the mass and density of something you cannot find the density.
This is legal, it can be done.
continental shelf
The mass that forms over the warm waters of the Atlantic Ocean is called a maritime tropical air mass. The source region for this air mass is labeled with the letter "m."