Multiple Choice
Where does Titan's thick,nitrogen-rich atmosphere (see the image below) come from? 
A) Photodissociation of methane in its atmosphere
B) Frequent volcanic eruptions
C) It has been deposited by cometary impacts over the age of the Solar System
D) Photosynthesis of algae in oceans that lie beneath its icy surface
Correct Answer:

Verified
Correct Answer:
Verified
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