So I'm studying for my upcoming ACT and I could really use some help on the science portion, especially the chemistry. On my pACT studying test, one of the questions asks:
"According to the information provided in the table, the concentration of which of the following ions and dissolved gases is constant for sediment depths of 10 cm or more?"
A. Sulfide (S^-)
B. Carbon dioxide (CO2)
C. Ferric iron (Fe(power of 3+))
D. Oxygen (O2)
(^ = squared)
my problem with this question is that I have no idea what sediment depth means, let alone what each of the answers sediment depths are. Can somebody please elaborate for me?
