Cancer – Mind – Knees: SEA

The water of seas and oceans is composed of an enormous amount of known chemical elements, many minerals derived from the earth’s crust and organic salts that come from animal and plant remains, in different proportions, which give it its salty taste. It also contains dissolved gases, such as hydrogen and oxygen, which make life possible.

The water found in the seas and oceans is of vital importance for human development. Not only is it the ecosystem where the species that are our food live, it is also a source of mineral resources that serve industry.

The oceans also play a very important role in the natural balance of the planet as they influence the redistribution of heat and cold. They interact with the atmosphere in a constant exchange of gases between air and water, so that half of the oxygen present in the atmosphere is generated by marine phytoplankton. Similarly, rainwater is water that has evaporated from the oceans.

The most notable physical property of seawater is undoubtedly temperature, just as the most relevant chemical property is salinity. Both properties are what determine the density of the water. However, these are not the only interesting properties of seawater. It is of great biological interest to know how light, and sound propagate in the ocean, or the color of the water, the degree of acidity, chlorinity and organic matter content.

The thermal properties of seawater depend on the heat it absorbs from solar radiation, and the amount of heat that returns from the sea to the atmosphere. The temperature of seawater ranges from -2°C (polar waters) to 37°C (in the Red Sea). The range of temperatures on land is greater and ranges from -68ºC (in Siberia) to 56ºC (reached in Death Valley, California). This shows the great thermo-stabilizing power of the sea, because, in reality, the air, land and rock formations of the planet heat up much faster and much more easily than water. And the same is true for cooling. That is why the oceans are excellent temperature moderators. In a coastal city, if we get close to the sea during the day, we notice that the thermal sensation is cooler and more pleasant, while moving away from the coast is warmer. During the night the exact opposite happens. All this is due to the processes of heating and cooling of the sea water.

I invite everyone to read Matias’ post with the topic of the day.


Finally, I encourage everyone to reflect on the concept of the day. No one else but us can re-signify our own being

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