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1.1. Study the Hydrosphere carefully and write a definition for this Earth's sphere in a DOC in your Personal Box.

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1.2 Study the Atmosphere carefully and write a definition for this Earth's sphere in a DOC in your Personal Box.

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1.3 Study the Lithospere carefully and write a definition for this Earth's sphere in a DOC in your Personal Box.

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1.4 Study the Biosphere carefully and write a definition for this Earth's sphere in a DOC in your Personal Box.

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