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How Old is The Earth

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Sam Mesri

on 25 November 2009

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Transcript of How Old is The Earth

How Old is The Earth Scientist say that at the beginning, our Earth was a giant sea of molten rock. The heat was caused by really fast collisions and once these collisions slowed down the earth began to cool. After cooling down the surface of the earth formed a crust. As the Earth kept cooling, water vapour started to escape the crust causing clouds to form. It is theorized that the true age of the Earth is 4.6 billion years old, right around the time the solar system was formed.
Scientists have an imperfect idea on the real age of the Earth because geologists have little amounts to measure from. One thing geologists are able to use to measure out Earth’s age is rocks. This means we can only measure to when the first rock formed on this planet, which gives us a pretty limited idea on the real age of the earth. The oldest rock found is about 3.9 billion years old. Rocks have been forming, wearing away, and re-forming ever since Earth took shape. The products of weathering and erosion are called sediment. Sediment is added in layers known as strata. Strata contain clues that help geologists learn about Earth's past. For example, some of these clues are fossils that form in rocks, and the formation of the sediment.
In our world today there are many different beliefs about how Earth came to be and how old it is. Scientist say that at the beginning, our Earth was a giant sea of molten rock. The heat was caused by really fast collisions and once these collisions slowed down the earth began to cool. After cooling down the surface of the earth formed a crust. As the Earth kept cooling, water vapour started to escape the crust causing clouds to form. It is theorized that the true age of the Earth is 4.6 billion years old, right around the time the solar system was formed.
Scientists have an imperfect idea on the real age of the Earth because geologists have little amounts to measure from. One of the ways we believe that the Earth is 4.6 billion years old, is because we are able to do radiometric dating and using that method we were able to find that the rocks are about 3.9 billion years old. This means we can only measure to when the first rock formed on this planet, which gives us a pretty limited idea on the real age of the earth. Rocks have been forming, wearing away, and re-forming ever since Earth took shape. The products of weathering and erosion are called sediment. Sediment is added in layers known as strata. Strata contain clues that help geologists learn about Earth's past. For example, some of these clues are fossils that form in rocks, and the formation of the sediment.
But this is only one theory. There are some people who don’t believe in that theory and instead they believe in the “Young Earth” arguments. One argument is that a certain amount of dust falls to Earth and the Moon every year. They say that if the moon is several billion years old, there would be 100 feet of dust because unlike Earth the moon has no wind to blow the dust away. But in fact the actual amount of dust as we saw when the first man landed on the moon was only 6 inches. Therefore they believe that the Earth must be much younger. The method of dating that was used to estimate the Earth’s current age and is most widely accepted would be by radiometric dating. Calculating a land mass so large and complex is unfathomable, dating of many different radioactive isotopes are required to give our earth an age. Different isotopes must be studied due to abundance of different isotopes in different locations on our earth i.e. Uranium-thorium is water soluble so it is precipitated selectively from ocean-floor sediments. The science of Stratigraphy is heavily involved in creating Earth’s geological time scale. Stratigraphy is the study of sedimentary and layered volcanic rock. The combination of these technologies and tools have dated our age to approximately
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