quote:Originally posted by Dru
quote:Originally posted by peter1955
When you drive by, it's pretty clear that the area directly above the highway at that point has nothing much to hold it in place.
And when you look at an airplane in flight, there are no cables holding it up, so it's pretty clear
that it's going to crash. Right?
God, man, that's not even logical. What were you thinking? Trying to make a connection like that is kind of like saying "Take Kevin Bacon, for instance. He is an actor, so he can pretend to be anyone. His name is Bacon. He has been married since 1988. Clear correlation between bacon, changing yourself, and not being single."
So, in simpler terms:
(a) The original forested slope wasn't as steep, and the rocks and sediment were held in place by a blanket of vegetation and tree roots. The slope was stable at that time.
(b) When the highway was built, the road was notched into the side of the hill, creating a much steeper incline from the road bed up to the remnants of the original slope above it.
(c) That same steep incline has been devoid of the roots and the vegetation that was holding the rest of the slope in place, and
(d) Because the water flow hasn't been restricted or diffused by the vegetation, it has been able to consolidate into paths where the flow is stronger than it was before, sweeping rocks and sediment down onto the roadway.
(e) That lack of stability also explains why the same area has been hit by mudslides before and can be expected to be hit by more in future.
These elements are what cause 'E R O S I O N'. Yes, it's a big word, but when you get into high school they'll teach you all about it. If you still don't understand, you'll have to study it on your own.
If you want, I can explain how airplanes fly, too.