( ( In weathering ) ( , ( ( hot sun ) ( ( causes ( ( the surface ) ( of ( a ( rock ( to expand ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN weathering))) (, ,) (NP (JJ hot) (NN sun)) (VP (VBZ causes) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT a) (NN rock) (S (VP (TO to) (VP (VB expand)))))))) (. .)))
In weathering, hot sun causes the surface of a rock to expand.
(ROOT (S (NP (NP (DT The) (NN surface)) (PP (IN of) (NP (DT the) (NN sun)))) (VP (VBZ is) (ADJP (RB much) (JJ hotter) (PP (IN than) (NP (NP (RB almost) (NN anything)) (PP (IN on) (NP (NN earth))))))) (. .)))