CHILD DEVELOPMENT PEDAGOGY

Read this passage:Fog everywhere. Fog up the river ____ fog down the river, where it rolls defiled among the tiers of shipping, and the waterside pollutions of a great (and dirty) city ____ Fog lying out on the yards, and hovering in the rigging of great ships; fog drooping on the gunwales of barges and small boats. Fog in the eyes and throats of ancient Greenwich pensioners, wheezing by the firesides ____ Chance people on the bridges peeping over the parapets into a nether sky of fog, with fog all round them, as if they were up in a balloon and hanging in the misty clouds.1-Charles Dickens, Bleak HouseWhat was a major cause of the conditions described in the passage?