( Humus ( ( is ( ( the ( dark ( brown ( or ( black part ) ) ) ) ) ( of ( soil ( formed ( from ( ( decayed ( organic matter ) ) ( such ( as ( ( leaves or ) ( other ( vegetable matter ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humus)) (VP (VBZ is) (NP (NP (DT the) (JJ dark) (NN brown) (CC or) (JJ black) (NN part)) (PP (IN of) (NP (NP (NN soil)) (VP (VBN formed) (PP (IN from) (NP (NP (JJ decayed) (JJ organic) (NN matter)) (PP (JJ such) (IN as) (NP (NP (NNS leaves)) (CC or) (NP (JJ other) (NN vegetable) (NN matter))))))))))) (. .)))
Humus is the dark brown or black part of soil formed from decayed organic matter such as leaves or other vegetable matter.
(ROOT (S (NP (NP (DT The) (JJ decayed) (NNS remains)) (PP (IN of) (NP (VBG living) (NNS organisms)))) (VP (VBZ is) (VP (VBN called) (NP (NNS humus)))) (. .)))