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What would be less expensive to build: a thousand meter high mountain or a thousand meter deep valley?

Asked by rebbel (35549points) October 5th, 2011

A Dutch journalist/semi proffessional cyclist came with the idea to build a mountain, a thousand meters high, so all kind of Dutch athletes (alpinists, cyclists, mountaineers, etc.) could use it to train on it and possibly win medals in their sports in major sport events.
If you climb a mountain there comes a point that you’ll (have to) descend it.
Turn the mountain upside down and you’ll have the same only now you first go down and then up.
Would one of the two be cheaper to make?

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