1. The document provides instructions for completing a task sheet on water balance. It asks the student to define key terms, copy an equation, explain how precipitation and evapotranspiration are used in the water balance, annotate a diagram, and describe annual patterns and differences in water balance for various regions using provided graphs. 2. Key terms to define include precipitation, evapotranspiration, soil moisture recharge, surplus, utilization, and deficit. 3. Students are to explain why these different water balance components occur and how understanding the water balance is important for predicting changes in river runoff throughout the year.