Some people consider the Earth to be alive because of its dynamic processes or cycles. Biogeochemical cycle is the turnover of different substances in the Earth and occur in different parts of the Earth like in the biosphere, lithosphere, atmosphere and hyrdosphere. Biogeochemical cycles help keep the Earth warm, recycle essential materials and is vital (or are needed) to living things.
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Family migration as a general concept covers family reunification, family formation, accompanying family members of workers, and the migration of a family unit as a whole. The following are key terms and concepts.
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Air mass, letter a is the correct one
