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"So is rest of the earth" ... when taken as a whole, though. Switzerland is not flat as a pancake, for example.

From what I understood from the video, the surface irregularities a general pancake can have when stretched to dimensions of the earth would lead to 10km high feature; Given even Mt. Everest is <9km, I am not sure why Switzerland wouldn't fit the definition

edit: Typo

If you stretch the pancake only to the dimensions of Switzerland, the vertical features would be a lot less high. And Switzerland has quite some height differences within a small area.

Or a more extreme example: If you stretched the pancake to just the width of Everest clearly Everest would be less flat.

The peaks measure ~9km above sea level. The deepest portions of the ocean add another 3-4km.

Not sure how to read this, but have you heard of the Mariana Trench?

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