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area that borders the southern part of the Sahara Desert
an accounting record or summary of all the trade transactions made between a country and the...
water that is the result of rain that has infiltrated the soil
the ratio between the prices of exports and the prices of imports in a country
(also called mean) the sum of a set of quantities divided by the number of quantities in the set...
the total number of people living in an area divided by the total area of cultivated land they...