I’m not entirely sure what is being asked here, but the Tigris and Euphrates rivers is the only place in Egypt (besides the nile delta) with non-arid ground. That’s why most people live around there:
The area of the Balkan countries is frequently plagued by ethnic conflict that generates tension among the nations. This tension has given away to several small conflicts and the trend continued. The location of the Balkans is strategically very important. I hope the answer helps you.
Oxidation - the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-coloured weathered surface.
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I think the answer would be The Rocky Mountains.