( ( The Earth ) ( ( ( ( makes ( ( one rotation ) ( around ( ( its axis ) ( in ( every ( 24-hour period ) ) ) ) ) ) ) , ) ( ( giving it ) ( ( a ( surface speed ) ) ( at ( ( the equator ) ( of ( ( 1,688 kilometres ) ( per hour ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN Earth)) (VP (VBZ makes) (NP (NP (CD one) (NN rotation)) (PP (IN around) (NP (NP (PRP$ its) (NNS axis)) (PP (IN in) (NP (DT every) (JJ 24-hour) (NN period)))))) (, ,) (S (VP (VBG giving) (NP (PRP it)) (NP (NP (DT a) (NN surface) (NN speed)) (PP (IN at) (NP (NP (DT the) (NN equator)) (PP (IN of) (NP (NP (CD 1,688) (NNS kilometres)) (PP (IN per) (NP (NN hour))))))))))) (. .)))
The Earth makes one rotation around its axis in every 24-hour period, giving it a surface speed at the equator of 1,688 kilometres per hour.
(ROOT (S (NP (PRP It)) (VP (VBZ takes) (NP (NP (CD 24) (NNS hours)) (PP (IN for) (NP (DT the) (NN earth) (S (VP (TO to) (VP (VB make) (NP (NP (DT a) (JJ complete) (NN rotation)) (PP (IN of) (NP (PRP$ its) (NNS axis))))))))))) (. .)))