Why is there salt in the sea?

Why is there salt in the sea?

Why is there salt in the sea?





Ah, the sun and the sea … perfect before you think about going back to school. But sometimes, when we just want to enjoy the present moment, the questions overwhelm us (especially when we’ve just been drinking): Because the sea is salty ? Come on, a little science can’t hurt.

Salt in the seas and oceans: how is it done?

The soil contains mineral salts. We are talking about rocks present 4 billion years agowhen the Earth had many volcanoes. There was no rain then, as we know it now, but condensation.

We had to wait 100 million years so that the water vapor turns into acid rain which began to pour on the rocks rich in mineral salts and, we give it to you in a thousand: in sodium mainly.

For millions of years, rain has eroded the soil and therefore it brought out the mineral salts (sodium plus chlorine which was in large quantities in the soil). The latter ended up in the water of the sea or oceans.

But this is where your analytical mind gets carried away (we know Mirror Mag readers): since it is the rivers and streams that bring this salty water to the sea, they too should be saltyno, but they are not or there are very few. The water, in fact, is continuously renewed by the rains; which is not the case with seas or oceans which are to be considered the terminus of this long journey and the receptacle of all mineral salts.

Analyzing the water of rivers and rivers, we might find infinitesimal traces of salt, but not enough to feel it by drinking it (by the way, don’t enjoy drinking this water, because you will be sick).

It is also common to realize that if the water level may have dropped (the water in fact evaporates to form clouds), the salt does not have this ability simply because it is too heavy to evaporate.. It therefore increases in quantity, unlike water.

Salt, so I float!

Eureka, after explaining the presence of salt in the oceans and seas of the planet, we move on to the next mystery: unlike the water of a swimming poolwe float better in the sea. It is thanks to the salt. Salt water becomes very thick and is able to float more or less heavy bodies.

Small scientific experiment: we take a liter of sea water in a bucket and extract the salt. Normally we would find 35 grams.

There is a sea, well known, the Dead Sea which contains 275 g per liter of water. Due to the high heat and evaporation, there is; as mentioned in the previous paragraph; more and more salt, and less and less water, especially since rains are not frequent in this region of the world. A person absolutely cannot drown in it: it floats effortlessly.

It is normal to wonder the effect that global warming of our seas and oceans. If the periods of heat wave and drought increase, the water level will lower (without being renewed by the rains) and therefore the salt will be more and more present. It is possible that even the North Sea will someday resemble the Dead Sea. Although the phenomenon is fascinating, it is above all worrying and should raise awareness of the climate emergency!

Caroline Tellier

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