hannahsophie
Oct 7, 2006, 07:41 AM
How thick is the earths crust on an average?
Thank you
RickJ
Oct 7, 2006, 07:54 AM
It varies around the planet. Here's a good explanation:
http://quake.usgs.gov/research/structure/CrustalStructure/
Starman
Dec 10, 2006, 09:32 PM
Rickj is right--thickness varies.
mean thickness = 24 mi (40 km), standard deviation is 5.4 mi (9 km).
thinnest = approx 9 mi (15 km)
thickest = 47 mi (75 km)