Assertion: oxygen | /r/HasProperty | produced
Facets:
value: straightforwardly
type: MANNER
value: from a number of materials
type: OTHER
Source sentences:
text: Oxygen can be produced from a number of materials, using several different methods.
text: In addition to the needed light, CO2 is readily absorbed by water (it’s about 200 times more soluble than oxygen) and the oxygen produced as a byproduct remains dissolved in water¹⁰.
text: Photosynthesis uses carbon dioxide and water to produce sugars from which other organic compounds can be constructed, and oxygen is produced as a by-product.
text: What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago.
text: Carbon monoxide/oxygen engines have been suggested for early surface transportation use as both carbon monoxide and oxygen can be straightforwardly produced from the atmosphere of Mars by zirconia electrolysis, without using any Martian water resources to obtain hydrogen, which would be needed to make methane or any hydrogen-based fuel.