Why are dairy farms often found close to
major urban centres?

To this day, many developed economies have a thriving agricultural industry, albeit naturally, with more modernized production methods. ... In developing countries, they've built their urban areas - usually with high demand for dairy products - far from milk production areas, mostly because of rushed planning.

South wales composes a lot of coal in that region.

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.