Read the following excerpt from the article “Icebergs,” which was posted online by the United States Coast Guard. As you read, consider how some common words used in science texts have multiple meanings.
~Much has been written about bottle-green icebergs that are sometimes seen in the Antarctic. Several mechanisms have been proposed, but the most likely explanation for the green color is the freezing of organic-rich seawater to the underwater part of the ice shelf from which the iceberg calved. The green ice is exposed after an iceberg breaks free of the shelf and rolls over.~
What does the word shelf mean in this excerpt?
1) a green iceberg
2) part of glacial ice
3) part of an iceberg
