A choropleth map displays numerical data using a color gradient. This kind of map can quickly display how a particular factor—such as population density or per-capita income—varies across regions or countries. Not only are choropleth maps easy to read, but they can be easy to create using Google spreadsheets. We did this to make maps of global urbanization for a new megacities lesson plan we’re working on here at Population Education. You and your students can follow these steps to join us as instant cartographers!