A hydrosphere is the total amount of water on a planet . The hydrosphere includes water that is on the surface of the planet, underground, and in the air. A planet's hydrosphere can be liquid , vapor , or ice .
The hydrosphere is one of the four spheres of the Eart system; the other three are the geosphere or lithosphere (solid rocky part of Earth), atmosphere (gases surrounding Earth), and biosphere (living things).
The hydrosphere includes all the Earth's water, consisting of saltwater, freshwater, and water vapor. It is part of the hydrological cycle that continuously moves water through various states. This system is essential for sustaining life and ecosystems on our planet.
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