I wanted to thank the list for generating a very useful and educational
discussion about the lithosphere, asthenosphere, and the so-called
"brittle-ductile transition". I now realize that a lot of my confusion
was justified since we clearly have a range of definitions for these
terms. It was very enlightening to hear all of the different views of
these thermo-mechanical layers.
I now have a much improved plan of how I will teach these terms to our
students, but I will refrain from posting the plan here as to not
encourage endless discussion.
I offer a sincere thank-you to everyone that responded to the list or to
Scott T. Marshall
Department Of Geology
Appalachian State University
572 Rivers St.
Boone, NC 28608