( We ( ( ( ( ( have already ) ( introduced ( the ( hydrologic cycle ) ) ) ) and ) ( understand ( ( water flows ) ( such ( as ( ( ( ( ( precipitation , ) evapotranspiration ) , ) and ) runoff ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VP (VBP have) (ADVP (RB already)) (VP (VBN introduced) (NP (DT the) (JJ hydrologic) (NN cycle)))) (CC and) (VP (VBP understand) (NP (NP (NN water) (NNS flows)) (PP (JJ such) (IN as) (NP (NP (NN precipitation)) (, ,) (NP (NN evapotranspiration)) (, ,) (CC and) (NP (NN runoff))))))) (. .)))
We have already introduced the hydrologic cycle and understand water flows such as precipitation, evapotranspiration, and runoff.
(ROOT (S (NP (NP (NN Precipitation) (CC and) (NN runoff)) (PP (IN in) (NP (DT the) (NN water) (NN cycle)))) (VP (VBP are) (ADVP (RB primarily)) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NN creation)) (PP (IN of) (NP (DT a) (NN lake))))))) (. .)))