Hydrosphere

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[hi-droh-sfeer]
A sphere that is comprised of all water and ice that is on the Earth’s surface (e.g., oceans, lakes, rivers, glaciers), underground, and in the atmosphere; one of the four spheres on Earth.  

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    An independent part of the system that is interconnected to other spheres by cycles and processes. The four spheres on Earth include the atmosphere, biosphere, geosphere, and hydrosphere.
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