Dozens of skyscrapers crowd the model from end to end, plate glass is everywhere suggesting that city planners see the Khartoum of the future shimmering like a giant chandelier over the desert.

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Given all the discoveries that we have made from an up-close investigation of these ocean ridges, we can't help but wonder what we might find at the far end of the same plate tectonic cycle where seafloor is drawn back into the Earth's interior at deep-ocean trenches.

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The cycle goes on and the levels of toxicity increases until you get to the top of the food chain with pelagic fish such as swordfish that end up on our dinner plate.

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"We'd have liked to see more activity in the first crucial hours, but we do feel they stepped up to the plate to do all they could and in the end, they did a proper investigation, " the Jolkowskis said in a prepared statement.

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The ocean overlaps one end of the plank and the other end is fixed to the ground (the interior of the tectonic plate).

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Use a photographic plate to record an image from a zenith-pointing telescope, and you will end up with a streaky image, as a result of the earth's rotation.

ECONOMIST: Mirror, mirror