( Gravity ( ( ( is important ) ( because ( it ( ( ( causes ( ( the planets ) ( to ( orbit ( the sun ) ) ) ) ) and ) ( ( produces ( convection cycles ) ) ( ( ( inside ( the Earth ) ) and ) ( in ( its ( ( atmosphere and ) oceans ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gravity)) (VP (VBZ is) (ADJP (JJ important)) (SBAR (IN because) (S (NP (PRP it)) (VP (VP (VBZ causes) (S (NP (DT the) (NNS planets)) (VP (TO to) (VP (VB orbit) (NP (DT the) (NN sun)))))) (CC and) (VP (VBZ produces) (NP (NN convection) (NNS cycles)) (PP (PP (IN inside) (NP (DT the) (NN Earth))) (CC and) (PP (IN in) (NP (PRP$ its) (NN atmosphere) (CC and) (NNS oceans))))))))) (. .)))
Gravity is important because it causes the planets to orbit the sun and produces convection cycles inside the Earth and in its atmosphere and oceans.
(ROOT (S (NP (NNP Gravity)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS orbits)) (PP (IN of) (NP (NP (DT the) (NNS planets)) (PP (IN around) (NP (DT the) (NN sun))))))))) (. .)))
Gravity is responsible for the orbits of the planets around the sun.