Tag Archives: data

ACT Question of the Day Explained – February 9, 2014 – Science

Today’s ACT science question of the day is a data interpretation question.  (Basically, we have to read a data table.)

We are given a table of sediment concentrations at various depths that’s something like this:

Depth
(cm)
Temperature
(oC)
pH Concentration in sediment (ppm)
SO42– S2– CO2 Fe3+ Fe2+ O2
 0  4 7.0 7.0 0.0 1.0 4.0 0.5 2.0
 5  5 6.5 5.0 2.0 1.5 3.0 1.5 1.0
10  7 6.0 3.5 3.5 2.0 2.0 2.0 0.0
15  9 5.5 3.3 3.8 3.0 0.8 3.8 0.0
20 10 5.0 3.0 4.0 1.0 0.5 4.0 0.0

The test maker would like us to tell them which ion and dissolved gas has a constant concentration at depths of 10 cm or more. Continue reading