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movement out of a rural area into an urban area
a development model in which economic development, social development and environmental factors...
weathering of rock as a result of chemical changes in the rock brought about through processes...
(also called average) the sum of a set of quantities divided by the number of quantities in the...
(also called gross national income, abbreviated as GNI) the total annual value of goods and...
economic activity based on producing a service such as banking, teaching, etc.