Definition of land – What it is, Meaning and Concept

EarthThe term Earthoriginating from the Latin landIt has several uses and meanings. You can refer to crumbly material that makes up natural soilthe land dedicated to cultivation or the floor/ground.

Earth is also used as a synonym for nation, country, region or territory: “Nadal consecrated himself in his land”, “The men of this land are quiet and lonely”.

When capitalized, the notion of Earth allows to name the planet that we inhabit It is the only planet on which, so far, the existence of life has been confirmed.

Earth is located at 150 million kilometers of Sun and is the fifth largest planet in the Solar system. formed a few years ago 4.57 billion years and has a unique satelite native: the Moon.

With a geoid shape (a sphere flattened at the poles), the Earth has a diameter of 12,700 kilometers and the 71% of its surface covered with water. Specialists have designed two Models to refer to the internal structure of the planet: the geostatic model and the geodynamic model.

The geostatic model establishes three layers: the Cortex (the most superficial layer, composed of the granite of the continents and the basalt of the ocean basins), the mantle (the intermediate layer, which reaches a depth of 2,900 kilometers) and the core (the deepest layer, with a thickness of 3,475 kilometers).

The geodynamic model, on the other hand, mentions the lithosphere (the most superficial part), the asthenosphere (which behaves fluidly), the mesosphere (also known as the lower mantle), the layer D (a transition zone) and the endosphere (which corresponds to the core of the geostatic model).

Documentary and history of the Earth

EarthThere is a cinematographic documentary that receives the name of “Earth” and it is an exquisite material in which a series of theories converge that allow us to know the actions that the human being has carried out on the planet and the consequences that they have had on the ecology. The material was collected over five years and allows us to see the process of devastation in the same place over the course of a year; being able to view the geographic and climatic changes of more than 200 places all over the Earth.

It is a work that has been produced by the BBC Natural History Unit, has been filmed absolutely in high definition (HD) and belongs to the television series entitled “Planet Earth”, broadcast on the small screen in 2006.

In this work the fundamental protagonists are the polar bears, the African elephants and the humpback whales, species that are in danger of extinction and that, each cycle they must face the absence of water, ice or food, increasing each year the risks of losing their lives, of becoming completely extinct.

To understand the history of the earth, the various life cycles in geological units. They are classified into larger units: composed of eons, which in turn are divided into eras and these into periods. Periods are made up of epochs and ages. We currently live in the Phanerozoic eonon the Cenozoic eraat Quaternary period and in the epoch named Holocene.

The data that scientists analyze to determine and temporarily divide the various stages are:
* Extinctions and changes or replacements in fauna and flora (disappearance of species or transfer of a group that was settled in one place, to another where its chances of survival are greater);
* Major tectonic-type episodes (movements in some terrestrial layer that modifies the surface and therefore the survival of flora and fauna that reside in it);
* Profound changes in weather (modification of the climatology that causes the extinction or migration of species to more favorable spaces, therefore flora and fauna are also modified);
* Major changes in sea level (Due to the melting or other variations in the composition of the earth, the sea level can increase or decrease, shortening space for the beings that inhabit the area).

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