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Human impacts are often magnified because of the hydrologic cycle. This is due to the fact that pollutants often follow the path of the water.

The hydrogen cycle consists of hydrogen exchanges between biotic (living) and abiotic (non-living) sources and sinks of hydrogen-containing compounds. Hydrogen (H) is the most abundant element in the universe. On Earth, common H-containing inorganic molecules include water (H₂O), hydrogen gas (H₂), hydrogen sulfide (H₂S), and ammonia (NH₃). Many organic compounds also contain H atoms, such as hydrocarbons and organic matter. Given the ubiquity of hydrogen atoms in inorganic and organic chemical compounds, the hydrogen cycle is focused on molecular hydrogen, H₂.

Human Impact

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Human impacts are often magnified because of the hydrologic cycle. This is due to the fact that pollutants often follow the path of the water

Withdrawal of Water

Humans remove water out of the system to irrigate crops, to provide us with drinking water and to carry out many of our industrial processes. Water also provides energy for many households and for many sanitation processes.

Discharge of Pollutants

Humans add substances to the water that cause its properties to change. As precipitation falls on the ground and moves into rivers and creeks, it picks up pollutants that range from dirt sediments to toxic chemicals. In rural areas, pollutants include farm pesticides, herbicides and fertilizers as well as wastes from septic systems. In urban areas, the pollutants include gas, oil, pet waste, fertilizers, pesticides, salt and treated human waste from sewage treatment plants. Pollutants often cause the

degradation and eutrophication of the water supplies.

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