That's not a full sentence. "the glacier" is a phrase, not a sentence.
A, but I'm honestly not sure what this question is asking. The Internet is obviously the easiest place to go to when you're in search of some kind of information. Going to a library or flipping through a paper card catalog would obviously take much longer than just opening up Google.
It helps you understand the story better and the characters within the story. How theyre all linked/connected in the story and why they act the way they do