What is the main difference between sandburg’s “fog” and frost’s "mending wall"?

"Mending Wall" was written by an American poet Robert Frost and "Frost" written by Carl Sandburg were both written in 20th century. There are many differences in between the written poems. First, The "Fog" uses metaphor and everyday language, while "Mending Wall" does not. "Mending Wall" is written in a modern format, while the "Fog" is not.

Select the word from the list that best fits the definitionstates the the universe is expanding