This photography by jacob riis, entitled, sleeping children. he was a photographer in new york city in the early 1900s who used his camera and skills to capture images in an effort to fuel change for the poor. this type of photography is called

I think the answer is social documentary photography.  Riis wanted to expose the problems caused by urbanization and industrialization.  Many families were living in very harsh conditions.  Through his photographs of the plight of the poor, the government took action and implemented many programs to improve their condition.  Riis also made use of flash photography when taking these pictures.  This made use of a device that brighten the picture.

i'm not too sure - if you could attach the picture

based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.