The answer would be : D. is more than $200,000 per year.
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Photon
The answer is D.
Many other countries, most notably Northern European countries, have higher GDP per capita (per-person) than the United States.
The Sahara desert is vast, large, dry, and empty of resources. This means people/armies wouldn't walk through there because it's basically suicide. This acts as a "natural barrier" because nobody would cross the desert in the first place.
Hope this helps!
I think it would be "A) Oil below Earth's surface absorbs precious water supplies." but I'm not positive
I guess so ....
Explaination:
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