Easy question

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jd

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9 Jun 2005
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Erosion. Ground above is eroded over time, until the thing is exposed at the surface. 8)
 
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Tom

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No, we are in a tube train here, the momentum moves it down a hill (as TPE said), but how does it get ABOVE ground, rather than underground? Note, I gave away the answer in this explanation, so see if you can get it.
 
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