Geography biography of the Earth

Earth is a stone planet that arose as a result of a collision of small stone bodies formed from particles of cosmic dust. For a long time the planet was red -hot, various substances erupted from its bowels. Among them are water vapor and compounds from which the primary atmosphere has formed. Gradually, the planet cooled down, and about 3 billion years ago its solid surface was formed.

Clouds began to form in the atmosphere, atmospheric precipitation fell. The primary ocean formed on the surface of the Earth. About 3 billion years ago, life originated in the ocean. We know more or less in detail how our planet and life have developed on it for the past million years. This time is customary to divide into the eras of ancient, medium and new life. The era of ancient life - Paleozoic - lasted - million years.

At the beginning of the Paleozoic era, life existed only in water. By the end of the Paleozoic, plants and animals settled all the continents. The Paleozoic era of medium -sized life - Mesozoic - lasted - million years. In Mesozoic, reptiles reigned - giant lizards, which inhabited land, ocean and air. The Mesozoic era of the new life - Kainozosk - began 60-70 million years ago and continues to the present.

Mammals appeared in the Cenozoic era, and about 2 million years ago a reasonable Homo sapiens man appeared. The Cenozoic era throughout history in all shells of our planet has occurred and changes occur.

The internal structure of the Earth in the center of the Earth is a solid metal - from iron and nickel - the core. This is a huge, according to earthly representations, a value. The inner core is surrounded by external, which also consists of metals. According to scientists, metals in the external core are in a liquid state. The internal structure of the Earth is the core surrounding the mantle.

This is the largest of the inner membranes of the Earth. At such high temperatures, the substance of the mantle should be in a molten state, but due to a huge pressure on the border with the core-it has the properties of both a solid body and fluid. The thinnest surface layer of the planet is called the earth's crust. The earth's crust is the upper hard shell of the Earth.

The upper part of the mantle has the properties of a solid body and, together with a solid earth's crust, is a lithosphere. The firm surface of the Earth formed about 3 billion years ago. The earth consists of a nucleus, a mantle and earth's crust. The mantle is the largest of the inner shells, and the earth's crust is the thinnest. The upper part of the mantle and the earth's crust form the lithosphere, or the stone membrane of our planet.

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