Discussion
The Mohorovicic discontinuity at 35 km, as a fraction of the earth's 6370 km radius, is about
Answer: B
Correct answer: 0.55 per cent
\[ \frac{35}{6370} = 0.0055, \] just over half a per cent. The crust on which everything we build stands is a very thin skin indeed - proportionally thinner than the skin of an apple - and the comparison is worth making whenever the crust is spoken of as though it were a substantial part of the earth.
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