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A rough calculation or an approximation of the value, number, quantity, or extent of something so that it is usable for some purpose even if the input data may be incomplete or uncertain.
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Is it possible to 'push' a path to the Earth's core?
This may very well be a question for Earth Science SE, but as it is very hypothetical, maybe pure physics is more appropriate...
Question:
Imagine we have have a wedge that tapers down into an infinit …