( ( The sun ) ( ( ( is ( ( the ( ultimate source ) ) ( of ( energy ( for ( life systems ) ) ) ) ) ) ( while ( ( heat ( convection currents ) ) ( ( deep ( within ( the earth ) ) ) ( are ( ( an ( energy source ) ) ( for ( gradually ( shaping ( ( the ( earth 's ) ) surface ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NN life) (NNS systems)))))) (SBAR (IN while) (S (NP (NN heat) (NN convection) (NNS currents)) (ADVP (JJ deep) (PP (IN within) (NP (DT the) (NN earth)))) (VP (VBP are) (NP (NP (DT an) (NN energy) (NN source)) (PP (IN for) (S (VP (ADVP (RB gradually)) (VBG shaping) (NP (NP (DT the) (NN earth) (POS 's)) (NN surface)))))))))) (. .)))
The sun is the ultimate source of energy for life systems while heat convection currents deep within the earth are an energy source for gradually shaping the earth's surface.
(ROOT (S (ADVP (RB Ultimately)) (, ,) (NP (JJS most) (NN life) (NNS forms)) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))