( Often ( ( ( red ( , iron ) ) ( rich ( ( clays or ) soils ) ) ) ( ( ( are erroneously ) ( referred ( to ( as laterite ) ) ) ) ; ) ) )
(ROOT (S (ADVP (RB Often)) (NP (ADJP (JJ red) (, ,) (JJ iron)) (JJ rich) (NNS clays) (CC or) (NNS soils)) (VP (VBP are) (ADVP (RB erroneously)) (VP (VBN referred) (PP (TO to) (ADJP (RB as) (JJ laterite))))) (: ;)))
Often red, iron rich clays or soils are erroneously referred to as laterite;
(ROOT (S (NP (NP (NNP Iron)) (PP (IN in) (NP (DT the) (NN soil)))) (VP (VBZ causes) (S (NP (NNS mars)) (VP (TO to) (VP (VB look) (ADJP (JJ red)))))) (. .)))