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The hydrosphere is a term that includes the total of Earth’s water resources such as lakes, oceans, streams, underground, surface water and finally snow and ice. The perennially frozen parts of the hydrosphere collectively referred to as the cryosphere. The atmosphere stores as well as large water reserves; nevertheless, it’s commonly separated from the hydrosphere. These two great water reserves connect all of Earths system through processes, for example, when it rains, water moves from the atmospheric reservoir into the hydrosphere.

The two systems

The two systems provide critical service for Earth as they store, purify and continuously redistribute water. There is water on the planet that has never been in any process or contact with the atmosphere, called juvenile or primordial water. This water is separate from the water of the hydrosphere. The interaction between the different parts of Earth is also called the Earth system science (Gaia hypothesis) and is how matter and energy move between:

The study of these interactions Earth system science. Water is an extraordinary substance as it can take different forms: frozen, liquid and gas. The structure of molecules at liquid state allows habitat (seeds) to live on surface water (if you fill a glass full of water, it is visible looking at the concave form above the top of the glass without spilling out water). Because of the different states, the sun heating water makes the water-cycle possible.

Sources and recommended reading
  • The blue planet: an introduction to earth system science/—3rd ed. Brian J. Skinner, Barbara Murck. Published 2007 by John Wiley & Sons, Inc.

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