Test students' ability to design a safe, self‑sustaining miniature terrarium that demonstrates the water cycle, plant needs, and basic composting. Require a simple materials list with age‑appropriate choices, a labeled sketch or diagram, step‑by‑step assembly instructions, and a short explanation of how evaporation, condensation and internal precipitation, light/soil/water meet plant needs, and decomposition will recycle nutrients. Ask for observable indicators and a brief monitoring plan suitable for Pre‑K–Grade 2 (days–weeks), plus basic safety notes and classroom adaptations.