The hydrosphere serves also as a planetary accumulator of inorganic and organic substance, which is brought in ocean and other reservoirs by the rivers, atmospheric flows, and also is formed in reservoirs. The presence of anions and cathions of different substances and elements in the form of solutions, and also accumulation of insoluble substances near the bed of the ocean is connected to transport and accumulating role of hydrosphere.

The hydrosphere always contained not only suspension and solutions of firm substances, but also solutions of gases, as it dissolves most of them. A special atmosphere is formed in the hydrosphere, and it is usually closely linked to the atmosphere of the Earth, the sources of gazes in the hydrosphere (mainly biological ones). On the first stages of its development hydrosphere contained small amount of oxygen, or sometimes no oxygen at all. But the live appeared in the ocean and living organisms provided ocean with oxygen. There is the point of view that oxygen degazed together with other gazes from the bowels of the Earth. The atmosphere of oceans was and is still very different from the atmosphere of the Earth, as the level of dissolvance of the gazes is different. This difference includes not only weight and content of the gazes, but also the variety of its characteristics according to the territory and depth. The modern contents of the dissolved firm substances and gases in hydrosphere is the result of its long evolution and at each stage of development different balance was established.

Sea water is a complex solution of salts, average saltiness of which makes 35 grams a in 1 kg of water. It is approximately a tea spoon of salt without top on a glass of water. The salt, dissolved in the ocean make weight 4,8*10²² g. If all salt suddenly falls on the bed of the ocean, the layer by thickness of 30 m would be formed. Evaporation of large sea pools happened in a history of a planet not once. This is proved by the amount of mineral salts.