This resource links to a rotation-based "game" created by NOAA and the National Weather Service.  I've also attached a 5E formatted lesson plan giving some background and introduction.  The activity should take about one class period, and there is a point-of-view writing activity included as extension.  You'll need to print out (and laminate for durability) the station cards and labels.  Be sure to print the student recording sheet as well.

This ThingLink provides links to several OERs curated from various repositories (oercommons.org, sharemylesson.com, curriki.org, app.partcipate.com) that all deal with teaching the states of matter to upper elementary students.  There is a full lesson plan from Ohio State University that deals with the water cycle, and specifically, with storage of fresh water in glaciers and snow.  There is a lot of information regarding student misconceptions and how to teach the content, as well as literacy resources and student engagement activities.  There is also a link to a full unit plan of labs and investigations, including PowerPoints and lab sheets for students.  Linked on this ThingLink, you'll also find an introduction video from PBS and a song about matter on YouTube.  Please feel free to add resources to remix!!