Assertion: carbon monoxide | /r/AtLocation | the environment
Facets:
value: naturally
type: MANNER
Source sentences:
text: Carbon monoxide can occur naturally in the environment.
text: Carbon monoxide can occur naturally in the environment, It is released into the atmosphere by volcanoes as they erupt, from the smoke of forest fires, from the natural gases in coal mines, and from lightning, Other natural sources of carbon monoxide are marsh gases, which are called methane and produced by plants decomposing underwater, marine algae, kelp & seed germination growth.