vacuum is formed by leaf weathering
dissolution is natural_process. dentate_leaf is leaf. vacuuming_carpet is vacuuming. dead_grass_leaf is natural_inanimate_thing. dust_in_air is not form_of_pollution. formed is not well_formed. formed is well_formed. dust_in_air is form_of_pollution. gaseous_form_of_water is steam. gaseous_form_of_water is not steam.