This article describes how students can participate in a citizen science project that addresses real-life local and global issues. They collect soil samples for the Soil Moisture Active Passive (SMAP) Project hosted by the international Global Learning and Observations to Benefit the Environment Program (GLOBE). Students choose and observe local soil collection sites, collect specimens, then compare soil moisture measurements, before and after drying. Their data is uploaded to the GLOBE website to be analyzed and used by scientists. Students also develop questions and investigate them using data retrieved via GLOBE’s Advanced Data Access Tool.