This is a matching-type question pairing fluvial/glacial geomorphic terms (List-I) with their genetically associated features or processes (List-II): base level relates to peneplain (the ultimate erosional end-product of prolonged base-level-controlled erosion), braided channel relates to aggradation (braiding results from excess sediment load causing channel aggradation), tarn relates to lake (a tarn is a small mountain lake in a glacial cirque), and till relates to drift (till is unsorted glacial debris, a type of glacial drift).