The document defines various geographic and environmental science terms. It provides definitions for river terrace, active glacier, active flood plain, old flood plain, cold water desert, ablation, flash flood, bedload, meander, cyclone, drought, flood, flood exposure, alluvial soil, anthracite, altitude, alluvia, badlands, bituminous, confluence, continental climate, culture, estuary, evapo-transpiration, fall line, and piedmont. The definitions are provided by Dr. Zafar Iqbal and range from 1-3 sentences each.