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Author Topic:   Mt. St. Helens
RAZD
Member (Idle past 1404 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 16 of 16 (596063)
12-12-2010 5:26 PM
Reply to: Message 14 by JonF
12-12-2010 11:38 AM


Hi JonF
... carved in mud or soft sediment form relatively shallow-angle walls (on the order of 45 degrees), ...
In soil engineering this is known as the angle of repose, and if you think about the physics involved, the force of gravity on the particles can be resolved into forces perpendicular and parallel to the slope, and at a point (that depends on the shape\friction between particles) the force down slope exceeds the force holding it in place.
but just to be complete here's the Vishnu Temple:
If you look closely at the pictures of the Grand Canyon, you will see piles of rubble\debris at the bottoms of the cliffs, formed by the stuff that has fallen off the cliff, and that shows the angle of repose of the material that the cliff is formed out of. This means that you cannot form a cliff from this material at a steeper angle before it has solidified into rock. This pattern is persistent throughout the total length of the Grand Canyon, and demonstrates that this cannot be due to a carve first solidify second process.
Enjoy.

we are limited in our ability to understand
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This message is a reply to:
 Message 14 by JonF, posted 12-12-2010 11:38 AM JonF has not replied

  
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