In article <c03qd6$42l$0@pita.alt.net>, Uncle Davey <noway@jose.com>
writes
>> To be conservative, start with giving the mountains a low average
>> density, say 2.2 g/cm^3 ==> 2.2 tonnes/m^3.
>>
>> Noelie
>
>In what way is that low when it is so much higher than than of sandstone,
>chalk or coal?
It is indeed much higher than that of coal, but the proportion of the
crust which is composed of coal is low. It is at the low end of the
range for sandstone (i.e. definitely not much higher than the density of
sandstone). It is lower than the range given for limestone, and is
appreciably less (i.e. definitely not much higher than the density of)
than a figure given for chalk.
http://www.mininglife.com/Miner/general/Density.htm
http://www.reade.com/Particle_Briefings/spec_gra2.html
--
alias Ernest Major
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