Assertion: lightning | /r/HasProperty | produced
Facets:
Source sentences:
text: The cloud must develop to a certain vertical extent before lightning is produced, so generally weather radar will indicate a developing storm before a lightning detector does.
text: The cloud must develop to a certain vertical extent before lightning is produced, so generally weather radar will indicate a developing storm before a lightning detector does.
text: Lightning is produced when electrical fields build up in the clouds as liquid and ice particles collide.