Punteo con algunas características de la Tierra primitiva?

Astronomers believe that 5 billion years ago began to form the solar system, from a cloud gas and immense dust and very hot, It is believed that the largest part of this cloud condensed slowly to form the Sun.

The nine planets, including the Earth, were formed from small portions of gases and dust that were circling around the newly formed Sun ; As its matter slowly cooled, the Earth was acquiring its form through millions of years, the heavier materials were united to form a dense nucleus, the crust and the primitive atmosphere were formed of lighter materials located in the Volcanic eruptions spilled lava from the hot regions of the interior, increasing the material of the crust, the steam that came out of these volcanoes condensed and fell again on the surface in the form of rain, as the Earth cooled, More water condensed to form the oceans.

The atmosphere of primitive Earth was not made up of the same gas mixture as the air we breathe, today's atmosphere is mostly nitrogen (N2) and oxygen (O2).

Scientists agree that the mixture of primitive Earth was different, but they differ in composition.

Most scientists think that the primitive atmosphere consisted mainly of ammonia (NH3) and methane (CH4) ; However, some think that it usually consisted of nitrogen and carbon dioxide ; There was probably some hydrogen (H2) and water vapor (H2O).