It’s well-constructed, and well-formatted.  That is, it’s got a good sturdy binding and all the important non-fiction text features like index, glossary, map, labels… It’s got nearly-full-page color illustrations that support the text.  I just wish it was better written: one page tells us “some rivers flow down to the ocean,” while another says, “The water flows into the ocean,” which sounds both redundant and contradictory.  Don’t all rivers flow into the ocean (unless they’ve been run dry by over-use before they reach it)? One page tells us, “A river is like a waterslide.”  Without any elaboration/explanation.  Did we really need a whole page dedicated to telling us that, “Rivers are full of water.” ?