Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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| 11 Sep 2014 03:00 AM |
In your middle school or high school science classroom, you may have seen a large poster of the periodic table hanging on the wall. The periodic table shows the types of atoms that make up the world around us. An element in the periodic table can come in different flavors called isotopes. Some isotopes are unstable, and over time these isotopes “decay” into isotopes of other elements. For example, Potassium-40 is unstable and decays into Argon-40. As time passes, a rock will have more and more Argon-40 and less and less Potassium-40. Radiometric dating is possible because this decay occurs at a known rate, called the “half-life” of the radioactive element. The half-life is the time that it takes for half the radioactive sample to change from one element into the other. Some isotopes have short half-lives of minutes or years, but Potassium-40 has a half-life of 1.3 billion years. Radiometric dating requires that one understand the initial ratio of the two elements in a given sample by some means. In this case, Argon-40 is a gas that easily bubbles out and escapes when it is produced in molten rock. Once the rock hardens, however, all the Argon-40 is trapped in the sample, giving us an accurate record of how much Potassium-40 has decayed since that time. So, if we find a rock with equal parts Potassium-40 and Argon-40, we know that half the Potassium-40 has decayed into Argon-40, and that the rock hardened 1.3 billion years ago. It’s hard to find rocks on the surface of the Earth that have not been altered over time. Most old rocks have been eroded by wind and water or submerged by continental plates. The oldest reliably dated rock formation is in Greenland, where several different isotopes were used to find an age of 3.6 billion years. Scientists also recently dated zircon grains (which resist erosion) in Western Australia to 4.4 billion years old. To find older rocks that haven’t been eroded, we need to look beyond Earth. Meteorites are rocks from the solar system that have fallen to Earth recently and haven’t suffered much erosion. Their pristine interiors give an age that dates back to their formation at the beginning of the solar system. Nearly all meteorites have the same radiometric age, 4.56 billion years old. Thus, the solar system, including the Earth, is about 4,560,000,000 years old. |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 04:18 AM |
finland never lies troll ur going 2 hell
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Scyblocks
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| Joined: 24 Mar 2012 |
| Total Posts: 26732 |
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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| 11 Sep 2014 01:49 PM |
| Thanks for telling me you didn't read it. |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 02:18 PM |
troll confirmed
ur going 2 hell
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 02:21 PM |
troll confirmed [2]
ur going to hell [2]
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Ludipup
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| Joined: 28 Dec 2013 |
| Total Posts: 4347 |
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jonny1367
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| Joined: 04 Jul 2010 |
| Total Posts: 33252 |
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| 11 Sep 2014 02:42 PM |
| You could've just posted "are you mentally handicapped people" and it would've sufficed |
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MrMeese
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| Joined: 28 Jul 2012 |
| Total Posts: 929 |
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| 11 Sep 2014 02:47 PM |
| He is obviously not a troll if he took his time to post all of that legitimate information.. |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 02:49 PM |
he is a troll before he posted this he posted a thread saying it is 6000 years old anyone who didnt believe is going to hell lell
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Roxer9000
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| Joined: 09 Sep 2010 |
| Total Posts: 5254 |
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| 11 Sep 2014 02:50 PM |
I just noticed that thinking of it.
bitte ein bier |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 02:52 PM |
am i the only smart person here
christ
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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| 11 Sep 2014 02:59 PM |
| And now I'm posting this to prove that it's not even possible for the world's age to be in the thousands. |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 03:00 PM |
you're a troll end of discussion
you failed scrub
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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| 11 Sep 2014 03:01 PM |
| Keep calling me a troll, maybe you'll feel better about yourself. |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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Roxer9000
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| Joined: 09 Sep 2010 |
| Total Posts: 5254 |
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| 11 Sep 2014 03:06 PM |
Dulexo, he said in here how the earth ISN'T 6000 years old
bitte ein bier |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 03:07 PM |
so over the course of 1 day he changes his mind and says its 4 billion years old instead of 6000 years old and anyone who believes its 6000 is an idiot
but before he thought it was 6000 years old and everyone who didnt believe was going to hell?
troll confirmed
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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| 11 Sep 2014 03:09 PM |
Show me this thread where I said the earth is 6,000 years old.
gg |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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| 11 Sep 2014 03:12 PM |
forget to neglect the fact its deleted?
http://www.roblox.com/Forum/ShowPost.aspx?PostID=145765470
gg no re
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Neraj1
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| Joined: 21 Dec 2008 |
| Total Posts: 2017 |
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Dulexo
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| Joined: 07 Mar 2015 |
| Total Posts: 32755 |
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