The planet Earth 4.5 billion years ago it was a mass of piled-up rocks whose core melted the planet. Over time, it dried and cooled until it became a Cortex solid and consistent. After a long cooling process, the formation of gases and the interaction with the air constitutes the atmosphere.
formation of the solar system
Scientific studies confirm that around 13.8 billion years there was a big explosion they called big Bang. The exorbitant force that was unleashed dispersed all the matter that was in all possible directions at also exorbitant speeds. As time passed, they moved away from the site of the explosion and slowed down. The nearby matter remained to become what are now the galaxies.
In the vicinity of the limit of our galaxy is found the Milky Way. These fractions of matter were condensed into a dense cloud about 5 billion years ago. All this matter was constituting an enormous mass thanks to the gravitational forces, until obtaining a sphere.
This enormous sphere was and is incandescent becoming a star that is the Sun. Other small masses around it also received similar processes at the same time that they marked orbits around the Sun. With them, these small masses were constituting planets and some satellites. At a suitable distance was located what in the future would be our planet, the Land.
formation of the earth
After all the processes suffered on Earth as we have anticipated at the beginning, the Earth begins to generate a certain stability. The formation of the Earth crust and the constitution of the atmosphere They are the beginning of a long journey. Until becoming a relatively habitable planet, several million years passed. Life on our planet was not created for another billion years.
The Earth, in its beginnings, was a kind of target for the meteorites. These passed through our current Solar system taking countless hits. The sum of the volcanic activity, which caused enormous masses of lava, was creating mountains that were solidifying until landscapes with reliefs were obtained.
The prolongation of volcanic activity It was generating an enormous amount of gases, ending up forming a layer on the surface that today is the atmosphere. This was the first protective layer created. At that moment a series of changes begins on Earth: electrical storms, condensations, rains… a new stage begins to develop.
The mixture of oxygen and hydrogen and the heat caused water steamwhich when rising towards the atmosphere was generating condensation with posterior rainfall. Over time the crust was getting colder. Rainwater was able to remain liquid in the deepest parts of the crust, with the consequent creation of oceans, the hydrosphere.
Geological history of the Earth
Since the formation of Land Until today, our planet has gone through countless processes and changes. From its first stages since the cooling and the constitution of a Cortex permanent, there is no evidence of what happened. The rocks that were being created dissolved again or disappeared swallowed by the Volcanic eruptions.
Those phases remain a mystery to man. All the cycles that the planet has gone through have erased the traces of that time.
Geological epochs, periods, eras and eons
The largest unit in geologic time is the Eon. It is divided into several ages geologicaleach era is made up of several periods and each period is divided into several times. Obviously, we will be able to have more geological data the more recent the geological period.
There are four types of rocks that offer us data on each crustal activity carried out throughout all these geological periods and they are:
- The sedimentary rocks. These have been caused through erosion and transport creating sediments. After compaction, several layers of this type of rock have been formed.
- The volcanic rocks. This type of rocks are those that have originated from magma, which was generating molten rock that after cooling have formed part of the earth’s crust.
- The precambrian rocks. These types of rocks are a series of geological structures that have been formed from existing rocks. These rocks, before being restructured, already had some type of deformation process.
The phases of the geological time scale are derived from the variations of the compositions fossils. Throughout history and with the persistence of experts, they have been found in strata successive.
aspects of planet earth
Experts have divided the great geological history of the Earth into two times:
- The Precambrianwhich includes the Azoic, Archean, and Proterozoic eras.
- The Phanerozoic, in begins with the Cambrian period until today whose epoch is the Holocene.
One of the greatest finds that allowed the experts of the 20th century to devise new dating methods, was that of radioactivity. Thanks to this discovery, it has been possible to study and assign ages of millions of years in the divisions of the time scale.
Life on earth
Approximately 2.5 billion years ago, the Proterozoic eon began. This word is defined as start of life time. By then they manage to join the warm and humid environment to create what would be the first living beings.
These unicellular organisms they needed 2,000 million years to have an organization with more complex forms. As the oceans stabilized and the atmosphere adjusted. It is estimated that 560 million years ago the first multicellular organisms.
With the appearance of these organisms, the Phanerozoic. This is where a large sum of fossils that show the presence of multicellular life on planet Earth.