Some rocks that are billions of years old have been found from the earliest era of the earth’s genesis. They are approximately 4.5 billion years old.
Stone fragments that go way back into the history of our planet have been detected beneath the crust. These exist between the core and the crust, that is in the mantle.
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The silicon found in this sample formed about 50 million years after the earth cooled down. Thus our planet took on the shape it currently has. A lot of changes took place during that crucial period of formation.
The proof of this formation of the earth so long ago was found in two radically separate areas of the globe. One was in Java whereas the other one was in the North Atlantic.
The planet earth when it was in a raw state, took tens of millions of years to collect itself and form accretions through the various shocking and jarring motions it underwent.
The biggest shock was a collision with a planet that was the size of Mars. It is this catastrophe that led to the genesis of the moon, the earth’s satellite.
The finding that points to the earth’s mantle, and its birthmarks that have been preserved intact, is quite an exhilarating study in geology. This research tends to point towards parts of the earth’s mantle being left behind in their original state and being reminiscent of a bygone era.
Scientists used to think that the mantle underwent upheavals and high heat thereby changing its consistency to a homogeneous mixture. However, there were voices of dissent by the year 2012.
That was the year when the experts found materials in the mantle dating back to 4.5 billion years in the distant past. Yet to think that these olden times are more than double the age of the first appearance of green algae in the earth’s oceans.
Radioactive isotopes are used to determine the age of a material of which the earth is composed of. These ancient parts of the earth were recognized by the presence of tungsten in them.
Tungsten was found in huge amounts during the formation of our solar system. Yet today it is not so abundant on the earth’s surface. The study was published in a journal. It will lend new insights and vital clues into the early formation of our home planet.
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The findings of this study were published by Science.