In the plate tectonics theory, the lithosphere is divided into
a. 100 major plates
b. 7 major plates and many smaller plates
c. many small plates, but no large plates
d. 50 major plates and many smaller plates

answer; ///the correct answer to the above question is (

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.