( ( Geothermal ( energy taps ) ) ( ( ( the heat ) that ) ( ( exists ( deep underground ) ) . ) ) )
(ROOT (S (NP (JJ Geothermal) (NN energy) (NNS taps)) (ADVP (NP (DT the) (NN heat)) (RB that)) (VP (VBZ exists) (ADVP (RB deep) (RB underground))) (. .)))
Geothermal energy taps the heat that exists deep underground.
(ROOT (S (NP (JJ Geothermal) (NN power)) (VP (VBZ is) (VP (VBN generated) (PP (IN via) (NP (NP (JJ underground) (NNS sources)) (PP (IN of) (NP (NN heat))))))) (. .)))
Geothermal power is generated via underground sources of heat.