The Sahel stretches across Africa, about 15 degrees north of the equator. Satellite measurements of vegetation reveal it as a transition zone between the sands of the Sahara and the jungles of the Congo. This map shows vegetation in the final two weeks
of June 2005, near the end of the dry season in the Sahel Dark green indicates dense vegetation, while light green and beige
indicate sparse vegetation and barren land.
How has man's presence in the Sahel contributed to the potential of desertification of the area? ALL BUT ONE could apply.
es )
A)
deforestation
B)
climatic changes
C)
overgrazing by livestock
D)
the buildup of salt in irrigated soils

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

the answer is b. dilution