In one of the corners of space millions of years ago, a powerful explosion.As a result of such a shock Star, which has long outlived her, she became like a huge cloud.It spun around and destroy the remnants of hot bodies.Millions of years unfamiliar and mysterious forces of nature attracted particles of clouds, thus forming a ball.A new celestial body is compacted in its structure and becoming more massive.Unprecedented pressure in the center of the ball has sparked a fire that was not repay.This flame enveloped the whole body - so the Sun was born.From the remnants of dead stars formed over time and the balls-planet.
Prior to the first era of the Earth structure of the planet was quite loose and loose, the size of it was even larger than that of the sun.Over time, compacted ball and he began to heat up, but then his face cooled.Before now able to fly into space, it was impossible to even estimate the approximate age of the Earth, and the samples from the moon, which is considered to be the same age as our planet showed that the beginning of the history of its development was put 4-4.6 billion years ago.Famous paleontologists at the time created a special geologic time scale, which is, in fact, is a chronicle of the creation and development of life on Earth.This scale was divided into periods and eras of the Earth, the duration of some of them in the hundreds of millions of years.
archaea.It was in this era began the evolution of the Earth.For two and a half billion years, the planet cooled and coated with a solid stone crust, oxygen in the atmosphere was not.When the temperature reaches a hundred degrees Celsius, the sky tightened dense clouds and heavy rain.After that, the surface of the globe were the seas and oceans, where life began then - the microscopic cells that can release oxygen.
Proterozoic.Follow the Archean era, the Earth has more closely associated with organic life.In times of Proterozoic appear multicellular organisms.Unicellular organisms combined, increased in size and formed the nucleus and membrane.There was a lot of different forms of construction of the structure of living organisms.
PALEOZOIC.In the Paleozoic era began active development of land by marine organisms.This stage was divided scholars for additional eras or periods, which makes it possible to study them in more detail.
Cambrian.The era is known more under the name of "skeletal revolution".And it made for good reason, because it was at the time the existing organisms acquired solid skeleton and spines, "houses" and shells.
Ordovician.At that time reigned creatures who remotely resembled today's scorpions and poisonous spiders.Also, there are small shellfish.But the most important achievement of this period - the emergence of vertebrates, specifically - chordates.
Silurian.A new period was marked by a modification of fish, algae output from the seas to the land and the appearance of vegetation on the rocks.
Devon.Many scholars have called this period "a kingdom of fish."Continued evolution and terrestrial organisms.
carbon.Dawn of flora and fauna: all grew green, blossom.There were the ancestors of modern conifers.Insects mastered the air.Some of them had a huge size: for example, a dragonfly wingspan can reach two meters.
PERM.Perm - Century overpowering deserts.During this period, it was formed Pangaea.
the Age of the Earth and their study allows each of us to know the origins of our unique world of nature, life and development of all orgasms on the planet.The history of our planet - is the most mysterious of all that exists today, and if you know its laws, you can discover a lot of interesting and unexpected.
