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[–] L_Etranger 0 points 1 point (+1|-0) ago  (edited ago)

There's at least 1k yards in a mile, so a cubic mile is about a billion cubic yards. A cubic yard of water would be at least a thousand pounds. So the granite will weigh more than a trillion pounds. I think the yard conversation up front was off by a factor of two and got cubed, so the actual amount might be up to 8x more. I feel like the water is actually about twice as dense as I remembered and granite is probably 2-5x as dense as water. So reasonably, it's several tens of trillions of pounds.

How did I do?

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[–] phw 0 points 1 point (+1|-0) ago 

You passed.

I got about 10-15 billion tons (uncertainty based on estimated density between 2.5 and 4) or 20-30 trillion pounds.