Assess students' ability to recall the typical target materials and applicable age ranges for common radiometric methods in Earth sciences — radiocarbon (14C), U-series (U–Th, U–Pb subsets), K–Ar/Ar–Ar, and Pb–Pb — and to identify which method is appropriate for given sample types (organic matter, carbonates, volcanic minerals, accessory minerals) and age brackets (e.g., decades to >Ga). Exclude decay equation derivations; focus on material–method–age associations and typical limits/uncertainties.