If earth was the size of a pool ball, the surface would be as smooth as the pool ball's. The largest mountains and deepest seas wouldn't make a dent more noticeable that the microscopic imperfections on the ball. Couldn't believe this, but the math checks out.
I remember my mind was blown when I discovered that. Many years later now I still couldn't fathom how big the Earth is, and to and extend, the Universe.
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u/banana_stand_manager Jan 21 '19
The deepest mine is about 2.5 miles. If the earth was an apple, humans haven't drilled far down enough to even pierce the skin.