Create A Civilization: The River
Most humans want to live near fresh water, which means that most civilizations settled near a river! Let's add a river to your students' civilizations.
I love the term "Synthesize" from the classic Bloom's Taxonomy, but it can be hard to know exactly what it looks like. My favorite "Synthesize Recipe" is to ask students to make a change to existing content and then explain the effects of that change to me.