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listEn to A pArt oF A lECturE in An ECology ClAss.

whAt is thE hyDrologiC CyClEA．thE EConomiC issuEs ConCErning wAtEr.
B．thE movEmEnt oF wAtEr through thE EArth AnD AtmosphErE.
C．thE ChAngEs in thE Amount oF rAin throughout thE yEAr.
D．thE ABsorption oF wAtEr vApor into thE AtmosphErE.