1. What’s the professor’s main point about Titan?
- A. Titan’s atmosphere is causing its surface conditions to slowly change.
- B. The chemical processes that occur on Titan are unique in the history of the solar system.
- C. Research on the atmospheric conditions on Titan may help explain how it came into existence.
- D. Studying Titan can help provide a better understanding of conditions on early Earth.
2. Why does the professor the amount of sunlight that Titan receives?
- A. To acknowledge that the differences between Earth and Titan are significant.
- B. To out point that many chemical processes are dependent on the presence of sunlight.
- C. To explain why it is surprising that pools of liquid are present on Titan’s surface.
- D. To point out a similarity between Titan and Earth’s moon.
3. What point does the professor make about the methane on Titan?
- A. It only exists as a liquid.
- B. It is a minor component of Titan’s atmosphere.
- C. It acts like water does on Earth.
- D. It may have originated on Saturn.
4. What does the professor say about meteor craters on Titan?
- A. Ice on the surface has covered them.
- B. Methane rain has eroded them.
- C. Pools of liquid methane have filled them in.
- D. Water ice ejected from volcanoes has eroded them.
5. Why does the professor mention the season on Titan in which the study of its largest lake was conducted?
- A. To suggest that the study was too short.
- B. To make a point about cycles of precipitation and evaporation.
- C. To acknowledge a difference between weather cycles on Earth and Titan.
- D. To describe a theory that explains freezing and thawing cycles on Titan.
6. Why is the professor excited about the presence of ammonia on Titan?
- A. Ammonia may have been the result of atmospheric changes on early Earth.
- B. Ammonia was present in significant quantities on Earth when life first appeared.
- C. The presence of ammonia has motivated scientists to look for atmospheres on other moons.
- D. The presence of ammonia often coincides with a rise in oxygen levels.