Assertion: lightning | /r/AtLocation | stratiform clouds
Facets:
value: in the dust
type: LOCATION
value: in gases
type: LOCATION
Source sentences:
text: Lightning is usually associated with cumulonimbus clouds (thunderclouds), but it also occurs in stratiform clouds (layered clouds with a large horizontal extent), in snowstorms and dust storms, and sometimes in the dust and gases emitted by erupting volcanoes.