Because of ________, soils developed in marine marshes can become extremely acid if drained for agriculture or used as topsoil.
A) oxidation of sulfides
B) reduction of sulfates
C) oxidation of sulfates
D) reduction of elemental sulfur
E) all of the above
Question 2
The principal form of sulfur taken up by plants is ________.
A) gypsum
B) sulfate
C) sulfides
D) elemental sulfur
E) sulfur esters