The following table represents the concentration of ions and dissolved gases in the sediment at the bottom of an ocean. A depth of 0 centimeters (cm) represents the tops of the sediment. The concentrations are expressed in part per million (ppm). The acidity of a solution is represented on a scale known as pH. A pH of 1 is very acidic, a pH of 7 is neutral, and a pH of 14 is very basic.
Depth Temperature Concentration in sediment (ppm)
(cm) (°C) pH SO4 2- S 2- CO 2 Fe 3+ Fe 2+ O2
Table adapted from R.M. Atlas and R. Bartha. Microbial Ecology: Fundamentals and Application. ©1981 by Addison Wesley Publishing Company.
A certain type of bottom-dwelling microorganism thrives under the following environmental condition: low concentrations of Fe2+, high concentrations of 02, and a neutral pH. Based on the table, at which of the following sediment depths would one most likely find the microorganism?
- 0 cm
- 6 cm
- 10 cm
- 15 cm
The correct answer is 0 cm.
Congratulations to Samuel Hinton!