Answers

2015-04-03T10:09:24+05:30
Smoke doesn't move along the ground as the smoke is lightweight and heated since the hot air move upwards the movement of smoke is against the ground. HOPE IT HELPS
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2015-04-03T10:26:52+05:30
smoke doesn't move along the ground
the reason is simple 
its 
light and it is realesed from factories 
so it is hot as it is released when something is burnt as we know that hopt air is ligher than cool air it moves up
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