Assertion: cold front's air | /r/CapableOf | form cloud
Facets:
Source sentences:
text: As this happens, the raised air cools and begins to form clouds.
text: air is forced to rise, and condenses to form clouds along the boundary between the two air masses.
text: The cold air is advancing into the warm air mass, undercutting it (cold air is denser than warm air) and lifting it, forming clouds and eventually rain.