Planet Earth | Educational facts and history of the planet Earth

Planet Earth

Is a rocky body, one of the largest planets in the solar system in terms of size and mass, featuring the highest density and higher level of attraction between all other planets, has the strongest magnetic field and is the fastest a Pirouette, and is the only planet where appropriate conditions for human life, with oxygen and food and all it takes human life.

 Figure of the Earth

He was an old man believes that planet circular in shape, but with the development of science of human knowledge could the true shape of the planet, is the body of the Oblate at the North Pole and South Pole, angular at the equator, and that the Dent is leading cause of circular motion, making a drop at the Equator than at the Arctic and Antarctic by about 43 Km.

The chemical composition of the planet

 The planet is composed mostly of iron, oxygen, silicon, magnesium, sulfur, calcium, aluminum, while the remaining portion of it consists of small amounts of other elements, and are attracted to heavier elements in the weight around its center, while lighter in weight items remain far from the center heading towards classes Foreign, and is the main component of iron mantel and crust is made up of oxygen, and all the components comprising the rocky crust almost a oxides, and the elements chlorine, sulfur, fluorine is one of the important elements.

The internal structure of the Earth

The inner part of the planet from several layers composed, based on chemical properties, Foreign thereof class is a relatively thin solid crust, and a thickness of about fifty kilometers, and consists of relatively light metals mostly silicate, and contains the continents, oceans and seas, and different thickness of one place to another, bodies of water opened a thickness of the average, while the crust consisting intercontinental ranges thickness of between 30 and 50 kilometers, as the planet of the lithosphere, which is characterized by coldness and rigidity consists, a crust surface portion of the mantle upper, consisting him tectonic plates and it is located scale flow down the lithosphere, and this band is a part of the upper mantle beneath the rigid rock band, featuring Suppleness low and his wife to allow rock flow.

Origins of the Earth

 Earth originated like the rest of the planets in our solar system, and based on what the world geological George Pfon mentioned in his book epochs of nature, the star of the sun collided and spread its parts in outer space to subsequently become planets, and came later to seven historic times to form in its final form now, and this the theory was the first theory to explain how the Earth arose during these time periods represented in the following:

 The first period, which lasted for 3000 years, during which the Earth was a celestial mass inflamed and fused.

The second period, which lasted for 3,500 years, in which the external earth's crust solidified gradually.

The third period which lasted for approximately 20000 years, which intensified the steam into the atmosphere to start marine sediments forming in the water, which started life.

The fourth period, which lasted for 5000 years, and in which a very large volcanic activities in the ground caused by the enormous rise in temperature.

 Fifth period in which returned calm and stillness of the planet, and remained the tropics are high temperatures, has led to the migration of organisms away from the tropics.

Sixth period in which the cracking occurs in the outer shell of the Earth, which created the life of man.

Seventh period in which the human-dominated on the ground, this period continues until the earth cooled and removed life.