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Originally Posted by cran
hmm ... OK ... thanks for that ...
it seems I confused miles/km in an earlier post ...
but 25 - 60 miles for crust is not supported by any of those sites ...
the first one mentions 6 - 90 km (~ 4 - 54 miles), though doesn't indicate where the 90km bit might be ...
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Hm... I seem to have been misinformed myself - my information about minimum size came from years ago. So I did some more searching. I used that first site for mantle & core figures.
Here is a USGS map of crustal thickness - mid-ocean trench thickness shows as 10kms which is about 6 miles. Interestingly is also shows a 50km depth under Scandinavia as the thickest part - not quite the 90km of the other site.