Ron M nous apporta ses lumieres en ce 26/01/2006 12:09:
> Darren New wrote:
> 
>> Now, volcanos I think don't tend to be quite so vertical, nor quite so 
>> symetric.
> 
> 
> Tough to generalize.
> 
> 
> Some like these:
>   http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig62.jpg
>   
> http://www.volcanodiscovery.com/volcano-tours/uploads/pics/semeru_53206_01.jpg 
> 
>   
>
http://images.google.com/imgres?imgurl=http://pubs.usgs.gov/dds/dds-40/images/JPG/large_screen/fig95.jpg&imgrefurl=http://pubs.usgs.gov/dds/dds-40/album.html&h=696&w=1024&sz=212&tbnid=zxYNryPeanCIFM:&tbnh=101&tbnw=150&hl=en&start=10&prev=/images%3Fq%3Dsteep%2Bvolcano%26svnum%3D10%26hl%3Den%26lr%3D%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN

> 
>   http://pubs.usgs.gov/dds/dds-40/images/JPG/small_screen/fig70.jpg
>   http://www.uoguelph.ca/~sadura/igref/strato.jpg
>   http://i1.trekearth.com/photos/13124/11_026_23.jpg
> are very symmetric.
> 
> And this one:
>   
>
http://www.volcanos.ms/images/Guatemala/2003_04_14_Expedition_Fuego/fuego_exped-9d-rueckweg-nach-soledad-fuego-eruption.jpg

> 
> seems very steep.
> 
> 
>> I also doubt you'd find snow on the slopes of an active volcano, as 
>> it's not unusual for the ground to be like 3000 degrees six inches down. 
> 
> 
> quite a few of those linked above have snow and appear active.
> 
When tha lava is very fluid, like in Awaii, the volcano get broad: the lava can flows
fast and far 
away before hardening.
When the lava is thick, the volcano gets steeper: it flows slowly and can't get far
before hardening.
That make Tek's volcano a thick lava variety. Those tend to send prety big lava blobs
on the air, 
when they shoot lava in the air... They also are more prone to have explosive
eruptions.

-- 
Alain
-------------------------------------------------
When the bosses talk about improving productivity, they are never talking about
themselves.

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