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A hydrosphere (from Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 ?d?? - hydor, "water
Water

Water is a common chemical substance that is essential for the survival of all known forms of life. In typical usage, water refers only to its liquid form or States of matter, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam....
" + sfa??a - sphaira, "sphere
Sphere

A sphere is a symmetrical geometrical object. In non-mathematical usage, the term is used to refer either to a round ball or to its two-dimensional surface....
") in physical geography
Physical geography

Physical geography is one of the three major subfields of geography. Physical geography focuses on understanding the processes and patterns in the natural environment, as opposed to the cultural or built environment, the domain of human geography....
 describes the combined mass of water found on, under, and over the surface of a planet
Planet

A planet , as 2006 definition of planet by the International Astronomical Union , is a celestial body orbiting a star or Stellar evolution#Stellar remnants that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared the neighbourhood of planetesimals....
.

Other hydrospheres
A thick hydrosphere is thought to exist around the Jovian
Jupiter

Jupiter is the fifth planet from the Sun and the Solar system by size planet within the Solar System. It is two and a half times as massive as all of the other planets in our Solar System combined....
 moon Europa
Europa (moon)

'Europa' is the Moons_of_Jupiter#Table Natural satellite of the planet Jupiter. Europa was discovered in 1610 by Galileo Galilei , and named after a mythical Phoenician noblewoman, Europa , who was courted by Zeus and became the queen of Crete....
.






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Water Cycle
A hydrosphere (from Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 ?d?? - hydor, "water
Water

Water is a common chemical substance that is essential for the survival of all known forms of life. In typical usage, water refers only to its liquid form or States of matter, but the substance also has a solid state, ice, and a gaseous state, water vapor or steam....
" + sfa??a - sphaira, "sphere
Sphere

A sphere is a symmetrical geometrical object. In non-mathematical usage, the term is used to refer either to a round ball or to its two-dimensional surface....
") in physical geography
Physical geography

Physical geography is one of the three major subfields of geography. Physical geography focuses on understanding the processes and patterns in the natural environment, as opposed to the cultural or built environment, the domain of human geography....
 describes the combined mass of water found on, under, and over the surface of a planet
Planet

A planet , as 2006 definition of planet by the International Astronomical Union , is a celestial body orbiting a star or Stellar evolution#Stellar remnants that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared the neighbourhood of planetesimals....
.

Other hydrospheres


A thick hydrosphere is thought to exist around the Jovian
Jupiter

Jupiter is the fifth planet from the Sun and the Solar system by size planet within the Solar System. It is two and a half times as massive as all of the other planets in our Solar System combined....
 moon Europa
Europa (moon)

'Europa' is the Moons_of_Jupiter#Table Natural satellite of the planet Jupiter. Europa was discovered in 1610 by Galileo Galilei , and named after a mythical Phoenician noblewoman, Europa , who was courted by Zeus and became the queen of Crete....
. The outer layer of this hydrosphere is almost entirely frozen, but current models predict that there is an ocean up to 100 km in depth underneath the ice. This ocean remains in a liquid form due to tidal flexing
Tidal force

The tidal force is a secondary effect of the force of gravity and is responsible for the tides. It arises because the gravitational force exerted on one body by a second body is not constant across its diameter....
 of the moon in its orbit
ORBit

ORBit is a Common Object Request Broker Architecture 2.4 compliant Object Request Broker . It features mature C , C++ and Python bindings, and less developed bindings for Perl, Lisp , Pascal , Ruby , and Tcl....
 around Jupiter.

It has been suggested that the Jovian moon Ganymede
Ganymede (moon)

'Ganymede' is a Moons of Jupiter and the List of natural satellites by diameter in the Solar System. Completing an orbit in a little more than seven days, it is the seventh satellite and third Galilean satellite from Jupiter....
 and the Saturnian moon Enceladus
Enceladus (moon)

'Enceladus' , is the sixth-largest Moons of Saturn of Saturn . It was discovered in 1789 by William Herschel. Until the two Voyager program spacecraft passed near it in the early 1980s, very little was known about this small moon besides the identification of water ice on its surface....
 may also possess sub-surface oceans. However the ice covering is expected to be thicker on Jupiter's Ganymede than on Europa.

See also

  • Biosphere
    Biosphere

    The biosphere is the global sum of all ecosystems. From the broadest Geophysiology point of view, the biosphere is the global ecology system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, hydrosphere, and Earth's atmosphere....
  • Cryosphere
    Cryosphere

    The cryosphere, derived from the Greek language word kryo for "cold" or "to cold", is the term which collectively describes the portions of the Earth?s surface where water is in solid form, including sea ice, lake ice, river ice, snow cover, glaciers, ice caps and ice sheets, and frozen ground ....
  • Earth's atmosphere
    Earth's atmosphere

    The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. Dry air contains roughly 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% Carbon dioxide in the Earth's atmosphere, and trace amounts of other gases....
  • Lithosphere
    Lithosphere

    File:Plates tect2 en.svgFile:Earth-crust-cutaway-english.svgThe lithosphere is the rigid outermost shell of a rocky planet....
  • Pedosphere
    Pedosphere

    The pedosphere is the outermost layer of the Earth that is composed of soil and subject to pedogenesis. It exists at the interface of the lithosphere, Earth's atmosphere, hydrosphere and biosphere....
  • Table of Global Climate System Components
    Table of Global Climate System Components

    Notes on Usage* This table is a reference tool for rapidly locating Wikipedia articles on Global Climate System Components...
  • Water Cycle
    Water cycle

    The water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth....


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