How long earth lived?

With the start of the history of the Earth, this planet was a giant, Red Hot, roiling sea of boiling rock fusion - a sea of magma. The heat was confirmed by the repetition of high-speed collision with a much smaller bodies in the area constantly the rocks of lumps together because they're on a collision course on this planet. Since the conflict began to fall on earth, cool and forms a thin crust on its surface. As a result of the cooling, water vapor began escape and condenses in the mass of small atmosphere. The clouds have trained and the storms raged, the more and more frequent water on the primitive earth, the colder surface until it is flooded by water, form the seas.

There is a theory that the actual age of the earth is about 4.6 billion years, roughly the same time as the rest of our solar system. The oldest rocks geologists were in a position to 3.9 billion years. Using radiometric methods of age determination for determining the age of rocks, the scientists must agree on the date on which the rock was originally formed (- minerals, when its first internal chilled). In the infancy of our planet around the world was melted (melted) rock, a sea of magma.

Since we can not be measured so far back in time, as we rock solid on this planet, we are only in the way we measure the actual age of the earth. The forces of the tectonic plates of our planet is also very dynamic, new mountains, the old wear, the volcanoes of the merger and restructuring of new crust. The continuous development and the revision of the earth's surface, the shape and reconstruction of the old Rocky has a few stones from the most to the earth when it was newly formed. Thus, the age is a theoretical age.

The secret When life begins

The scientists are still trying to unravel, one of the biggest mysteries of the earth: When is it that the "life" in a first step, and how it was he? It has been estimated that the first forms of life on Earth were primitive, unicellular organisms, the approximately 3 billion years. It is almost everything about it for the next two billion years. Suddenly, this unique organizations have started to become involved in multicellular organisms. Then an unprecedented abundance of life in the incredibly complex forms began to fill the oceans. Some marine research and took residence on Earth, possibly to evade the predators in the ocean. A chain cascade of new and ever more sophisticated forms of lives around the world to virtually nullified by a massive extinction unsettled. It would be the first of several mass furchtbarsten in the history of the earth.

The scientists were more and more space to explain this furchtbarsten mass in the streets as happens, watches since the beginning of "alive". Maybe we were regularly surrounded by stones more space (ie the asteroids), or the collision of neutron stars happen too close to comfort? Each time a species has taken place, life has found a way back from the edge. Life is a stures adherence to this small blue planet for the last three billion years. The scientists in the research new evidence about how life began on Earth, in some places very interesting - the depths of the ocean.

Consideration of fossil

The scientists examined the rocks with the help of radiometric methods to determine the age of the earth. Another very cool thing they found in the rocks, tells us more about the history of the Earth from the past are the remains of living organisms, in the rocks of all time. We call these fossils. It was the attention of the Earth, the fossils were the pictures exciting, what types of creatures, parcouraient this planet. Fossilisés skeletons huge creatures with claws and teeth, ancestors day species (such as the Sharks) remained virtually unchanged, while millions of years, and with lush jungle of prehistoric plants, all with a wealth of life and a variety of species, remaining in the Populate Earth, even in relation to the periodic furchtbarsten mass.

As you study the fossils, scientists have found that the earth is a very different climate zones in the past. In fact, the climatic conditions General, and the species, for different periods in the geological history of Earth. For example, the periodic warming of the earth - during the Jurassic and Cretaceous periods - an abundance of plant and animal life, was behind generously of organic substances from their decay. These layers of organic material in the course of millions of years without each other. They were among the young people of compressed sediments and what we fossil fuels such as coal, oil and natural gas.

By rotation, the Earth's climate has also periods of extreme cold, to the long periods that most of the area was covered with thick sheets of ice. This geological periods are called, ice and the earth had several times in its history. Any kind of climate species died during these periods to be entirely new species from the life of the things that will not be tolerated and survive in the very cold climate. Believe it or not, the people were during the last ice age - the Holocene (about 11500 years) - and we have managed to survive. The creatures like the mammoth wollige - a distant relative of the modern elephant - was not the case.