I love these books!  This is the third one by this pair I’ve gotten, the others being A Leaf Can Be… and Water Can Be…, and I have loved them all.  The illustrations are fabulous and support the text, which is poetical.  With just a couple words per page, the text serves to list different forms and contexts in which we encounter rocks, from mountains to paving stones to the moon.  In order to make the rhyming work, the words are often figurative, and just in case the illustrations aren’t enough to aid the reader in deducing the author’s meaning, pages in the back of the book offer further explanation for each of the names given to rocks in the main body of the book.  An excellent resource to accompany a unit on rocks, as well as a beautiful choice for casual reading.