"Xenon, the second heaviest of the noble gasses, is only found in trace amounts in the atmosphere.
So far so good.
[The] [a]tmosphere contains less xenon than other lighter noble gasses.
Could be read as meaning that the other noble gasses contain more xenon than the atmosphere, but as a sentence it's passable.
...it is hiding in the earths mantle.
It's called [the] Earth, and you forgot the possesive apostrophe.
Now a group at the University of Bayreuth in Germany think that they might have found the answer.
"The answer," given the context, can only seem to mean that they've found out where the xenon is hiding, but...
I[t] turns out that xenon does not dissolve easily into magnesium silicate perovskite, thus it cannot hide there. And because it had no place to hide, it is now gone forever."
Oh, okay, so "the answer" seems to be "we still don't know, but it's not where we thought it was"? Rather than "it is now gone forever" it seems (from reading one of articles, shock horror) that it was never actually there in the first place - perhaps substituting "come from" in place of "hide" would have made more sense.
Yours sincerely,
Captain Pedantic
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/c33QNn3s2z0/where-has-all-the-xenon-gone
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