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an imaginary line extending between the north pole and the south pole
(also called a geyser) place where warm water shoots out of the crust in volcanic areas
the removal of salt from sea water to make it safe and fit for human consumption
(also called spontaneous population movement) the voluntary movement of people from one place to...
a scheme whereby water from one river system is moved to another river basin where less water is...
the development of material wealth and increased standards of living for the entire population...