(S (S (S (NP (BASENP (ADJP (NN Nutrient) (JJ rich)) (NNS pollutants)) (VP (VBN composed) (PP (ADVP (RB mainly)) (PP (IN of) (BASENP (NN nitrogen) (CC and) (NN phosphorous)))))) (VP (VP (VBP come) (PP (IN from) (BASENP (ADVP (RB far) (RB away)) (NNS places)))) (S (VP (VBN carried) (PP (IN by) (BASENP (NNS rivers))))))) (CONJP (COMMA ,) (CC and)) (S (PP (IN nearby) (BASENP (DT the) (NN bay))) (VP (PP (IN from) (NP (BASENP (NN farm)) (CC and) (BASENP (JJ metropolitan) (NN runoff))))))) (PERIOD .))