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The hydrosphere encompasses all of Earth's water, including its oceans, seas, rivers, lakes, groundwater, and atmospheric water vapor. As a component of environmental chemistry within the broader context of environmental science and science as a whole, the study of the hydrosphere examines the chemical properties, processes, and interactions of water in these diverse environments. This can include exploring the cycling of nutrients and pollutants through aquatic systems, understanding how human activities impact water quality, or investigating the influence of climate change on Earth's water resources. In this hierarchy, the hydrosphere serves as a focal point for examining the complex relationships between chemical processes and Earth's water bodies, offering valuable insights into both environmental science and chemistry.