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    hannahsophie's Avatar
    hannahsophie Posts: 1, Reputation: 1
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    #1

    Oct 7, 2006, 07:41 AM
    How thick is the earths crust?
    How thick is the earths crust on an average?
    Thank you
    RickJ's Avatar
    RickJ Posts: 7,762, Reputation: 864
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    #2

    Oct 7, 2006, 07:54 AM
    It varies around the planet. Here's a good explanation:
    http://quake.usgs.gov/research/struc...stalStructure/
    Starman's Avatar
    Starman Posts: 1,308, Reputation: 135
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    #3

    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)
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