Assertion: diatom's role | /r/CapableOf | generate oxygen
Facets:
value: in cycling silica
type: LOCATION
value: through photosynthesis
type: MANNER
Source sentences:
text: Though tiny, diatoms play an important if unseen role in Earth's carbon cycle — marine diatoms generate oxygen through photosynthesis — and in cycling silica, which makes up about 25 percent of the planet's crust and which diatoms incorporate into structures in their cell walls.