THE AGE
OF THE EARTH
Hey… Just as we celebrate our
birthdays to commemorate the day we were born, has it ever occurred to you to
ponder on the age of the earth? Don’t you think that there was a day (way back)
when the earth was formed?
The
Earth is approximately 4.6 billion years old!!! Sounds absurd???
Well, this
figure did not come as a result of fiction or imagination – but by radiometric dating
in the early 20th century. Lead in uranium-rich minerals when dated
by early scientists, were able to
discover that they were billions of years old.
Another
pointer to this is that small crystals of Zircon obtained from Jack Hills,
Western Australia when dated, was around 4.4 billion years old.
One may ask: “How is this
possible”?
Rocks
are aggregate of minerals. Some of these minerals have radioactive elements
like Uranium and Thorium. In the process of their decay (radioactive decay),
other elements are formed which are stable.
The age
of a rock (which has a radioactive element) can be calculated from the
information gotten from the measurement of the concentration of the stable end
product of the decay of that radioactive element and its initial concentration
(i.e. the initial concentration of the decaying element) provided that its half
life is known.
What is the formula for calculating half-life?
ReplyDeletet1/2 = In(2)/λ
DeleteSometimes don't you feel like going back in time and seeing how the earth used to be
ReplyDeleteYea. I feel. Infact the beauty of geology is that the present is the key to the past
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ReplyDeleteThank you. I appreciate
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DeleteSuch a informative post, thanks to admin for sharing this useful post keep going on��..
ReplyDelete