The visualization seems to be saying that toxic places and things can be hidden from view but a consequence of multiple industrial processes.
I do not understand this question. I cannot provide an answer to this.
This image was created by the ethnographer during a fieldtrip. The composition is strong I think, as the space opens up in front of the viewer - drawing your eye to the figures in the photo. The scientist (although they could be anyone, in theory, we only know this or assume this because we are told of three people walking to the field site) stride ahead - one looking down and one looking ahead. Not waiting for you. The grey cloud that hangs over the silhouette of the person hand loading sand into the lorry is very portentous.
This image and its caption demonstrate the long journey for the ethnographer to the field site, in this case quite literally. Your journey started at a conference some time before (it is not clear when the photo was taken - this could be useful information in the caption perhaps) when you first met Dr. Mar. But it also required there having to be a field trip to be invited on, being invited to attend the field trip, and the slightly more obvious physical journey including undertaking a multi-mode transport route to get there.