What is tide?

What Does tide Mean

The etymology of tide leads us to the French word marée . A Gallic term this that, in turn, emanates from Latin. Specifically from "mare", which can be translated as "body of water".

The tide is the movement made by the waters of the sea when descending and ascending alternately and periodically . This oscillation is a consequence of the attraction exerted by the moon and the sun .
Objects that have mass are attracted to each other by the natural phenomenon known as gravity . The moon and the sun, in this framework, exert forces of gravitational attraction on planet Earth : the tide is the effect of these forces on the oceans.

Due to these forces , the tides develop and the sea level changes periodically. It is important to bear in mind that modifications are also recorded due to rains, winds and other factors that are not related to the tides.
The continuous and slow rise of marine waters is called flow . When the sea reaches its maximum height, it reaches high tide or high tide . From this point, the progressive descent , called reflux , begins . The minimum height, meanwhile, is called low tide or low tide . Then the flow re-develops and so on.
From high tide to low tide (and vice versa) it takes approximately six hours . It should be noted that the flow is due to the progressive increase in solar and / or lunar attraction, while the ebb is related to the progressive decrease in said attraction .
Likewise, we must not forget that one of the best-known songs of recent times by the Spanish musical duo Amaral, formed by Eva Amaral and Juan Aguirre, is entitled “When the tide rises”. It is a song that was presented in 2011 and is included in the album entitled "Hacia lo wild".
It is called red tide , on the other hand, to the spread of microalgae in the water in a certain region. These microorganisms generate toxins that affect mollusks: if a person later ingests these animals, they can become intoxicated.
The black tide finally appears when a spill occurs oil in the water. These accidents damage the ecosystem in various ways.
In the same way, we cannot ignore that in Spain there is also talk of the green tide. This is the name given to a group of protests against cuts in education that took place during the 2011-2012 school year.
It was in the Community of Madrid where the mobilizations of this type were carried out, especially by teachers due to the worsening of the conditions in the classrooms imposed by the PP. However, these also had the support of parents of students and the whole of society in general.

The increase in the ratios in nursery schools, the elimination of compensatory classrooms, the notable decrease in the public offer of teaching employment, the reduction of night high school groups and different salary cuts are the situations that led to the so-called green tide. A name that it received because the demonstrations wore T-shirts of that color where it could be read: “Public School of all for all”.

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