Lithosphere
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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.
You would find it in the disk.
The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today.
