( ( ( ( Density-driven upwelling ) ( of ( nutrient-rich water ) ) ) ( -LRB- ( ( from ( hydrothermal activity ) ) -RRB- ) ) ) ( ( could ( ( ( ( ( ( contribute nutrients ) ( to water ) ) ( at ( ( the bottom ) ( of ( the ( floating ice ) ) ) ) ) ) , ) and ) ( ( allow ( development ( of ( low-temperature ( microbial communities ) ) ) ) ) ( like ( those ( on ( ( Earth 's ) sea-ice ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (JJ Density-driven) (NN upwelling)) (PP (IN of) (NP (JJ nutrient-rich) (NN water)))) (PRN (-LRB- -LRB-) (PP (IN from) (NP (JJ hydrothermal) (NN activity))) (-RRB- -RRB-))) (VP (MD could) (VP (VP (VB contribute) (NP (NNS nutrients)) (PP (TO to) (NP (NN water))) (PP (IN at) (NP (NP (DT the) (NN bottom)) (PP (IN of) (NP (DT the) (VBG floating) (NN ice)))))) (, ,) (CC and) (VP (VB allow) (NP (NP (NN development)) (PP (IN of) (NP (JJ low-temperature) (JJ microbial) (NNS communities)))) (PP (IN like) (NP (NP (DT those)) (PP (IN on) (NP (NP (NNP Earth) (POS 's)) (NN sea-ice)))))))) (. .)))
Density-driven upwelling of nutrient-rich  water (from hydrothermal activity) could contribute nutrients to water at the bottom of the floating ice, and allow development of low-temperature microbial communities like those on Earth's sea-ice.
(ROOT (S (NP (NNP Density)) (VP (VBZ allows) (SBAR (S (NP (NN cut)) (VP (VBZ logs) (S (VP (TO to) (VP (VB float) (PP (IN on) (NP (NN water)))))))))) (. .)))