A. collapsing dust clouds
As countries become more developed, the productivity edge that urban regions have over their countries declines. This makes sense, development leads to urbanization which leads, eventually, to the convergence of the productivity of metro areas and the country as a whole. Cities are changing fast.
Answer:
Scotland, many lakes and inlets are called C. lochs.
Yes it developed but am not really sure what you mean
The earth's orbit is responcible