emergence of land directly related to the formation of the solar system.Of course, all the theories about the origin of the Earth is only a hypothesis, which is constantly revised based on new data.Currently considered the main hypothesis about the formation of planets in the solar system, including Earth, clouds of gas and dust orbiting the sun.
about 4.6 billion years ago through gravitational collapse of a cloud of interstellar dust of the sun appeared, which became the center of a new planetary system.Around the Sun was formed from the disk of gas and dust material clouds.This disc at high speed revolved around the sun, particles in it interact constantly, repelled and incorporates seal created in the disk, so it gradually broke up into separate parts, the so-called
largest planetesimals began to attract other clumps of matter and compacted under the influence of gravitational forces.The solar system during its formation had a form different from the present, it included about 100 protoplanets, but the system was much smaller than it is now.Proto-planet faced, forming the planets known to us today, including the Earth, at the same time formed the planets and satellites, such as the Moon.
Originally, Earth had a very high temperature, ie the substance on it is molten and stirred vigorously, more dense metals fell down, forming a metallic core, silicate rose up, forming a mantle.Metallic core made possible the appearance of the planet's magnetic field.
planet gradually cooled, decreased volcanic activity in the atmosphere accumulated large amounts of water.Cooling of the planet led to the formation of the crust.About 3.8 billion years ago on Earth it appeared the first living organisms formed the biosphere, which dramatically affected the further development of the planet.