Which of the following statements apply to the asthenosphere, but not the lithosphere?
1.deforms mainly by brittle fracturing and faulting
2. partial melting of rising granitic plumes produces huge volumes of basaltic magma
3. zone in the upper mantle that deforms by plastic flowage
4. cool, rigid layer of crust and upper mantle that forms the tectonic plates
Answers & Comments
Verified answer
3. zone in the upper mantle that deforms by plastic flowage
Question is on this practice test
http://www.uamont.edu/facultyweb/edson/ch_5%20prac... (answer key below)
Another source:
"Overall, the asthenosphere is plastic, which is the key to the ability of Earth's crust to slowly migrate in pieces. Situated above the asthenosphere is a cool, rigid layer called the lithosphere, which includes the entire crust as well as the uppermost mantle."
https://docs.google.com/viewer?a=v&q=cache:NcDkHFG...