Sea water is salty because of the minerals and salts dissolved in it. Rainwater in nature contains almost no minerals, but as it falls and enters rivers, it collects small amounts of minerals and salts from the earth. This water then enters the oceans, where it accumulates over time, causing ocean water to become increasingly salty.
The most common salt in seawater is sodium chloride, that is, Cook’s Salt. It makes up about 85% of the total salt content. Other salts present in smaller amounts include magnesium, sulfate, calcium, and potassium. These salts come from a variety of sources, such as weathering of rocks, dissolution of minerals on the ocean floor, and volcanic activity.
The concentration of salt in the ocean varies from place to place, but the average salt content is about 35 parts per thousand. This means that each liter of seawater contains about 35 grams of dissolved salts and minerals.
The salt content of seawater is important for many reasons. It affects the density and buoyancy of water, which in turn affects ocean currents and circulation. Salt content also affects the freezing and boiling temperatures of seawater, which can affect marine life and climate.
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