Choose the word which is different from the rest.

The answer is E. Valley.

A peak is the top of a mountain. A mountain is a large landform that rises significantly above the surrounding land. A hillock is a small hill. A mound is a raised area of land, typically smaller than a hill. A valley is a low-lying area between hills or

The word “valley” is different from the rest of the words in the list because it is the only word that does not refer to a landform that is elevated above the surrounding land.