For each of the following factors, indicate whether the pH increases or decreases and explain why the factor may cause variation in pH in streams or water bodies (read background pgs. 4 and 5):

a) Photosynthesis (6CO2 6H2O > C6H12O6 6O2): pH increases / decreases

Photosynthesis can increase the pH level of the water and the reason is because it removes carbon dioxide that is present in the water.

Explanation:

Photosynthesis is a chemical process/cycle that is executed by plants by consuming carbon dioxide and releasing oxygen into the air or water.

The photosynthesis can cause the pH level of the water to rise because of the removal of carbon dioxide from the environment.

I hope this answer helps.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: