( ( ( This form ) ( of pollution ) ) ( ( is ( caused ( due ( to ( loud sounds ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This) (NN form)) (PP (IN of) (NP (NN pollution)))) (VP (VBZ is) (VP (VBN caused) (S (ADJP (JJ due) (PP (TO to) (NP (JJ loud) (NNS sounds))))))) (. .)))
This form of pollution is caused due to loud sounds.
(ROOT (S (NP (NP (DT The) (NN sound)) (PP (IN in) (NP (DT a) (JJ loud) (NN classroom)))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NN energy))))))) (. .)))