There are 4.55 billion years, dust old giant stars are the proto solar nebula rotates around what will become of our Sun. The earth is not yet established.
The disk surrounding the proto-sun heats from birth, the size reached 200 AU (astronomical unit). He begins to solidify and atoms stick to each other to form grains of material. Thus is created the phenomenon of accretion.
Grain dust condenses, gravity increases attracting more and more objects, big and small. Over time a huge ball of rock covered incandescent lava is formed. | | The Earth looks so young, a huge ball rock fusion.
Since the first microorganisms to humans through the first oxygenated atmosphere, the first aerobic organisms, the first external skeleton animals in the seas, the first fish, the first marine and terrestrial reptiles, the first plants, First insects, dinosaurs, mammals and primates, the Earth has left, which allowed us to define the characteristics times of its history. The Earth is only half of his life and geological eras to come, remain very long. | | The geological time span of today, there are 4.6 billion years, at the time of the birth of the Earth.
This story begins with the first deep time of Earth's, the hadéen via Archean, Proterozoic and the ends of the Phanerozoic.
The hadéen represents 700 million years, the Archean 1.3 billion years, the 2 billion Proterozoic and Phanerozoic years 540 million years.
The best eras are defined on the last million years. |
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