Mystery Theme IV: Back To School by KlionskyG

Question 7

As I learned from my 10th grade chem/phys teacher Mr. Cipolla*, the study of inland aquatic ecosystems (including reservoirs, ponds, rivers, etc.) is called what? (As it turns out, my mnemonic for remembering the word conflated the Greek root in the answer with a Latin root related to his name.)

* to whom I have sent the link to this quiz. Hi, Mr. Cipolla!

Limnology (MNO)