Given a scientific passage and an answer, generate a question for the given answer.
--------
Question: Passage: Whales and bats have the trait of echolocation. This is the ability to locate objects in the dark by bouncing sound waves off them. The most recent common ancestor of whales and bats did not have this trait. Apply lesson concepts to explain how the trait evolved in whales and bats. Answer: echolocation

Answer: What term is defined as the ability to locate objects in the dark by bouncing sound waves off them.

Question: Passage: Describe hurricane formation and the damage they cause. Answer: bacteria

Answer: Yogurt is made with milk fermented with what?

Question: Passage: Oceanography is the study of the oceans. The word oceanology might be more accurate, since "ology" is "the study of. " "Graph" is "to write" and refers to mapmaking. But mapping the oceans is how oceanography started. Answer: oceans

Answer:
What is oceanography the study of?