What is the history of the Earth's crust?
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Earth, its farthest layer, consisted of about 4.44 billion years ago, about 100 million years after the country itself. 4.44 billion years ago, the Earth's crust was completely melted due to residual heat from the initial collapse of the planet. The evidence that the Earth's crust has cooled up to 100 million years old comes from the measurement of the levels of Hafnia in the hills of Jack in Western Australia, one of the oldest areas of exposed bark today.
During the initial creation of the Earth's crust, an event known as an iron disaster, where the thicker elements of the ground like iron and nickel, dropped to the core, while lighter elements, like silicon, formed the bark at the top.
The bark began to cool when the country was at least 40% of its current size and had sufficient gravity to detain the atmosphere containing water vapor. Much of this early water vapor would come from comets. This era in the history of the country, ranging from the birth of the country to about 3.8 billion years, is known as the Hadean era, the Greek Hell, Hades, for the difficult belowminers on the planet at that time. Scientists believe that the Hadee era was lifeless.
About 4.0 to 3.8 billion years ago, at the end of the serpent era, the planet went through late heavy bombing, a time period with many major asteroid effects. These impacts could literally break the bark of the virgin country and prevented the creation of any long -term continents. In practice, looking back 3.8 billion years ago is difficult because the oldest rock formations are about this age. The only earthly minerals older than these are individual rocks and crystals that at that time provide less information about the overall global state of the Earth's crust.
about 2.7 billion years ago, photosynthetic life has evolved. It released a huge amount of oxygen, insulate it from the water in the process of photosynthesis. The Earth created an oxygen atmosphere and oxygen began to associate with most elements on the surface and formed a huge amount of oxides. DayS is most of the Earth's crust composed of silicon oxide.