During my career as a middle school teacher, I've made use of a number of biogeochemical cycle dice games that are readily available in several variations on the internet. A couple of days ago, as I was bringing the illustrated dice I had for the water cycle, I thought that this would be the last year I could use that particular set - they were a little crumpled from handling and the pictures had faded. While creating the dice is not hard, I was a little unmotivated to do it and wondered whether there was another way to still use the activity but save me the work of recreating the dice every so often.
It has now been several days, but I did it! A digital version of the water cycle dice game.
Now, of course, this would not be the way to show it to students, so I posted it up for actual use on a Google site, with a link to a record sheet -
Not being able to stop myself at just the water cycle, I then went ahead and created a page and "game" for all other cycle games I use.
After playing any of the games, you could have students write stories or draw cartoons with the information they gathered or discuss how difficult/easy it is for a molecule to leave a specific reservoir. If they play more than one, they can also compare their journeys in both (which reservoirs are present in two or more, which processes are similar, etc.)
I would love to hear more ideas about what you could do with them.