Before that, let us understand the sense of Earth:
Earth is a planet all living residence and its contents. As a place to stay living beings, the earth is composed of several layers of earth, the materials forming the earth's materials, and all the natural riches contained therein. Shape Earth's surface varies, ranging from land, sea, mountains, hills, lakes, valleys, and so forth. Earth as one planet that is included in the solar system in the universe is not silent like what we expected all along, but the earth do the rotation on its axis (rotation) and moves around the sun (revolution) as the center of the solar system. This is what causes day and night and tides. Therefore, the process of formation of the earth is inseparable from the process of formation of our solar system.
Once understood, this is the process of formation of the earth from a few theories:
1.Theory Big bang
This theory is the most famous adalh gan.
Based on Big Bang Theory, the process of formation of the earth originated from tens of billions of years ago. At first there is a giant mist that rotates on its axis. Round it does allow small sections and lightly thrown out and the big gathering in the center, forming a giant disc. One day, mist it exploded with a mighty giant in space which then formed the galaxies and nebulas. During a period of approximately 4.6 billion years, these nebulas freeze and form a galaxy called the Milky Way galaxy name, then formed the solar system. Meanwhile, the light which was thrown out earlier experience condensation to form clots that cooled and solidified. Then, the clots that formed the planets, including planet Earth.
In its development, the planet continues to experience a gradual process and to form it is today. There are three stages in the process of formation of the earth, namely:
1. Initially, the earth is still a homogeneous planet and have not experienced the bedding planes or different elements.
2. Formation bedding planes of the earth structure that begins with the occurrence of differentiation. Material iron greater density will sink, while the lighter specific gravity will move to the surface.
3. Earth is divided into five layers, namely core, outer core, the mantle, outer mantle, and crust.
Changes in the earth caused by climate change and weather.
2. Fog theory Kant-Laplace
Since the time before Christ, the experts have a lot of thinking and conduct an analysis of the phenomena of nature. Start the 18th century scholars have been thinking about the process of the Earth.
Do you remember about the theory of cloud (nebula) put forward by Immanuel Kant (1755) and Pierre de Laplace (1796)? They are famous for fog Kant-Laplace theory. In this theory proposed that in the universe there is gas which is then assembled into mists (nebulae). Style of attraction between these gases form a very large collection of fog and spin faster and faster. In the process of this rapid turnover, the material parts of the equatorial haze thrown separated and solidified (for cooling). The part is then thrown into the planets in the solar system.
3. Planetesimal theory
A century after the fog theory, appear planetesimal theory proposed by Chamberlin and Moulton. This theory has revealed that at first there is the sun of origin. At one point, solar origin is approached by a large star, which caused the withdrawal of the sun. Due to the withdrawal of solar energy from earlier, there was a great explosions. The gas explodes out of the sun's atmosphere, then condenses and freezes as solid objects, and called planetesimals. Planetesimal is in its development into the planets, and one of them is our planet Earth.
Basically, the theoretical processes of the planets and the earth, starting with a temperature gaseous daribenda very hot. Then, because the process time and the rotation (centrifugal) fast, then the cooling occurs that causes compaction (on the outside). Adapaun Earth's inner body temperature is still high.
4. Tidal Theory of Gases
This theory is put forward Leh jeans and Jeffreys, namely that a large star near the sun in a short distance, causing the body tides on the sun, when the sun was still in a state of gas. The occurrence of the tides that we know on Earth, size, very small. The reason is the small mass of the moon and the distance of the moon to Earth (60 times the radius of Earth's orbit). However, if a star of mass almost as large as the sun approached the sun, it will form a kind of giant waves mountains on the sun's body, caused by an earlier star attraction. Mountain-guung will reach extremely high and formed a huge glowing tongue, protruding from the mass of the sun earlier and stretch towards the big star.
In this hot tongue occurs refinement gases and finally the columns will be split, then split into separate bodies, namely the planets. Big star that caused the withdrawal of the body parts of the sun above, continue the journey in the universe, so that will gradually lose its influence on the earlier-shaped planet. The planets will revolve around the sun and experience the process of cooling. This cooling process will be slow on large planets, like Jupiter and Saturn, while the small planets like our Earth, runs relatively faster cooling.
While the cooling progresses, the planets were still around the sun in elliptical orbits, so it is probable that at some point they will approach the Sun within a short distance. Due to the withdrawal of solar power, there will be ups and downs in the bodies of the new born planet. The sun will draw material from the columns of the planets, so was born the months (satellites) that revolve around the planets. Sun held the role in shaping these months in principle the same as a big star role in shaping the planets, as has been discussed above.
5. Twin Stars Theory
This theory was put forward by an expert Astronomy RA Lyttleton. According to this theory, galaxies come from a combination of a binary star. One star exploded so much material that was thrown. Because the star that exploded not have the force of gravity is still strong, then the fractional distribution of stars surrounding the star explosion that did not explode. Stars that do not explode it is the sun, while the fraction of stars are the planets that surround
Conclusion
There are two conclusions that can be drawn from the description of the process of formation of the earth, namely:
1. Earth comes from a giant mist burst explosively, and then forming galaxies and nebulae. After that, the nebula freezes to form the Milky Way, then surya.Bumi systems formed from the small light that was thrown out when a giant exploding mist that cools and solidified, forming the earth.
2. The three-stage process of formation of the earth, starting from the early Earth formed, differentiation until the earth began to split into several zones or layers, namely core, outer core, the mantle, outer mantle, and crust.
