Which Solar System term is correctly associated with important fact: “its average density is lower than water”, and also with “a gas giant”?

Correct Answer: Option D — Saturn. Saturn is correct because it is its average density is lower than water. Saturn is also associated with a gas giant. A further identifying fact is that Saturn is has the most visually prominent ring system. Another useful fact is that Saturn is associated with its average density is lower than water. Why the other options are incorrect: Option A — Uranus: It is methane contributes to its blue-green colour and is associated with an ice giant; those are the identifying facts of Uranus. Option B — Neptune: It is Triton is its largest moon and is associated with an ice giant; those are the identifying facts of Neptune. Option C — Moon: It is its gravity is the main cause of ocean tides and is associated with Earth's natural satellite; those are the identifying facts of Moon. Exam Takeaway: Link Saturn with “its average density is lower than water” and “a gas giant” for quick revision.