What do you know about the composition of sea water? how can you prove that seawater is a solution?

The chemical composition of seawater depends on a wide range of motion mechanisms. Rivers add dissolved and particulate chemicals to ocean fields. Particles carried by the wind are carried to regions of the middle ocean thousands of kilometers from their continental source regions. Hydrothermal solutions that circulate through the earth’s crust under the seabed add both dissolved and dispersed materials to the deep ocean. Organisms in the upper ocean convert solutes into solids, which eventually settle to greater depths in the ocean. Particles en route to the seabed, as well as materials both on and within the seabed, undergo chemical exchange with surrounding solutions.