Re: What makes the land where land slides occur susceptable to weathering?

Hello and sorry about the delay
The question came in the middle of final exams here and I left immediately 
afterwards, but now I am back to work and answering your question is on the 
top of my list!
Weathering occurs in several ways physical and chemical and biological
Physical weathering occurs due to hot-cold, wet-dry, shrink-swell, and 
related physical processes.  The net result is usally a fragmentation of 
particles.  Chemical weathering occurs by such things as oxidation (rusting 
is an example). biological weathering is caused by living organisms, but is 
realy a combination of the other two.

Now as to your question.
When landslsides occur they often expose soil or other substances that were 
previously buried.  The buried sediments, rocks and other stuff was 
protected from both chemical and physical weathering.  After the landslide 
they are exposed to new and variable conditions which favor weathering

interesting phots of weathering: http://www.geo.duke.edu/geo41/wea.htm

some terms http://bellnet.tamu.edu/res_grid/cuedwe17.htm