The Gateway Arch- Common Noun
St. Louis, Missouri- Proper Noun
Hope this helps :)
What book is this from? Can't help without knowing.
An appositive phrase modifies the subject of a sentence and is usually separated from the rest of the sentence using commas.
In this sentence, the appositive is one of Jupiter's moons.
<span>the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun. hope this helps</span>