Is the student text plagiarized?

Compare the student text with the source. Source: Jennifer Armstrong, Shipwreck at the Bottom of the World, page 2. Published by Crown, 1998: Antarctica had never even been sighted before the nineteenth century. Until then it was a rumor, an undefined, unseen guestion mark shrouded in fog and surrounded by ice. Student text: Prior to the nineteenth century, Antarctica was just "a rumor, an undefined, unseen question mark shrouded in fog and surrounded by ice" (Armstrong 2). Is the student text plagiarized? No, it is not plagiarized. Yes, because it fails to cite the source. Yes, because it fails to use quotation marks and fails to cite the source