Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Oceans are the major source of water vapor in the atmosphere. Sunlight heats water near the sea surface ( Figure below ). As the water warms, some of it evaporates. The water vapor rises into the air, where it may form clouds and precipitation. Precipitation provides the freshwater needed by plants and other living things. Answer: ocean
Output:
What is the major source of water vapor in the atmosphere?