Final answer:
Water conservation, wastewater treatment, and proper disposal of hazardous waste are activities that have positive effects on the hydrosphere.
Step-by-step explanation:
Some activities of humans have positive effects on the hydrosphere. One example is water conservation. When people use water efficiently and avoid wasting it, they help preserve the quality and quantity of water in rivers, lakes, and other bodies of water.
Another activity with positive effects on the hydrosphere is the implementation of wastewater treatment systems. These systems treat and remove harmful pollutants from domestic and industrial wastewater before it is discharged into the environment.
Proper disposal of hazardous waste is another important activity. When hazardous substances are disposed of correctly, they don't end up polluting the hydrosphere and posing risks to aquatic life and human health.
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