What branch of earth science studies the great lakes

Oceanology or oceanography

Explanation:

Oceanology or oceanography  can be described as a branch of Earth Science under which The physiological and biological aspects of the Great Lakes and Oceans are studied. This branch of Earth Science is further divided into many branches such as oceanography, chemical oceanography, geological oceanography and physical oceanography so that every aspect of the oceans can be studied in detail. The field of Oceanology is dynamic and versatile.

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the answer is third world countries, take for instance china, they restricted each family with only one child,

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