Water and the earth. How is water stored on earth? (polar ice, underground, sea water, atmosphere), How much water does the earth have? How does water shape land? 2. 1. Water and the human body. How does a human being's water content change throughout his life? (fetal stage, at birth, adulthood). How much water do we consume in our lifetime? 3. Water and agriculture 4. Water as a universal solvent

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