POH is a measure of the in solution. *

Both acids and bases can measured using the pH or pOH scale. Both scales provide a measure of either the H+ concentration or the OH- concentration. Notice that each scale shows were acids and bases both are located. When acids are measured, the pH is less than 7, but the pOH is greater than 7.

Explanation:

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.