By level 3, I love digging into LONG units. Things we can study and consider and really form opinions about. I write some of my own units and I use a lot of meatier readers to accompany them. Although there aren’t as many “units” in my level 3 class, these fill the school year.
I am not tied to any particular order for most of these units! I do like to do Biodiversity first since the weather is nice and they can get out in the woods but otherwise, I often let them “pick” what we study next. Really we will study it all anyway but it is fun to give them the choice of what’s next.