History of the Earth: Precambrian Ages

I shall write somethings to you about the history of our planet, from its foundations to the quaternary… And maybe, beyond.

Since the Precambrian is the first period, I shall start by speaking of it.

The Precambrian represents more than 85 percent of geological time during which the earth changed from a molten ball to a planet with continents, oceans, and an atmosphere. In the latter part of the precambian the first tectonic plates developed, life evolved, and oxygen built up in the atmosphere. It begins 4600 millions of years ago, upon the formation of the Earth.

The formation of the earth is an interesting chapter of our knowledge… It binds physics, chemistry, geocentrism, maths, biology, well… Everything!

It began when large group of rock and gases joined, and made the sun. It had a large dust ring…Most probably bigger than the diameter of the solar system. This dust, joined again in smaller scales than the first one. This originated planets… Such as Mercury, Venus, Earth, Mars, Jupiter etc…

It was a slow process. After rocks joined to make planet earth, the planet was still boiling rock and receiving constant meteorite strokes. There is a lot of debate about if water existed by this time.

Gaia, another (ancient) planet of the solar system, collided with earth, and this made our moon. This also increased global temperatures.

Life first appeared in the Precambrian , the very first beings were prokaryotes, mycroscopic single-celled bacteria-like. They probably appeared in hot waters around deep-sea volcanic-vents. Their fossils appear to be around 3500 million years old. The firstmulticellular organisms arose in the late Precambrian, we call them eukaryotes. Jellyfishes and Worms appeared in this era, as well as unsuccessful bizarre species unrelated to later animals. The Vendian race was born at this time(such as Dickinsonia and Ediacara).

~ by lord8argos on April 11, 2008.