( ( ( ( ( ( Waves ( that ( ( travel ( in ( the rocks ) ) ) ( below ( ( the surface ) ( of ( the earth ) ) ) ) ) ) ) ( are ( called ( body waves ) ) ) ) , ) and ) ( there ( are ( ( ( ( ( ( ( two types ) ( of ( body waves ) ) ) : ) ( ( ( primary , ) or ) ( ( P , ) waves ) ) ) , ) and ) ( ( secondary ( , ( or ( S , ) ) ) ) waves ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NNS Waves)) (SBAR (WHNP (WDT that)) (S (VP (VBP travel) (PP (IN in) (NP (DT the) (NNS rocks))) (PP (IN below) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN earth))))))))) (VP (VBP are) (VP (VBN called) (NP (NN body) (NNS waves))))) (, ,) (CC and) (S (NP (EX there)) (VP (VBP are) (NP (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN body) (NNS waves)))) (: :) (NP (NP (JJ primary)) (, ,) (CC or) (NP (NP (NNP P)) (, ,) (NP (NNS waves)))) (, ,) (CC and) (NP (UCP (JJ secondary) (, ,) (CC or) (NN S) (, ,)) (NNS waves))))) (. .)))
Waves that travel in the rocks below the surface of the earth are called body waves, and there are two types of body waves: primary, or P, waves, and secondary, or S, waves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))