Water

Water is found in many places on Earth including on the surface of the planet, within rocks below the surface, and in the atmosphere.  Water travels between different areas of the Earth through the water cycle. About 70% of the Earth surface is covered with water, and most of that is the ocean. Only a small portion of the Earth's water is freshwater, which is found in rivers, lakes, and groundwater. Freshwater is needed for drinking, farming, and washing. In addition to liquid water, water is also present on Earth in the form of ice. Without water, life as we know it would not exist.

This beautiful sunset was captured off the coast of Chile in October,
  2009. Earth's ocean covers more than 70% of our planet's surface. <a
  href="/earth/Water/ocean_motion.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">Ocean
  water is always moving</a>. It moves around by <a
  href="/earth/Water/ocean_currents.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">surface
  ocean currents</a>, <a
  href="/earth/Water/ocean_upwelling.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">upwelling</a>,
  <a
  href="/earth/Water/ocean_tides.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">tides</a>,
  and the <a
  href="/earth/Water/circulation1.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">global
  ocean conveyor</a> or <a
  href="/earth/Water/circulation1.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">thermohaline
  circulation</a>. The ocean's tides are one type of tide created by <a
  href="/glossary/tidal_forces.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">gravitational
  force</a>.<p><small><em>Image courtesy of Carlye Calvin</em></small></p>The <a
  href="/earth/Water/ocean.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">oceans</a>
  are full of <a
  href="/earth/Life/life1.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">life</a>.
  Anthias are small, peaceful reef fish, and are a significant fraction of the
  colorful fishes seen in <a
  href="/earth/climate/coral_change.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">coral
  reef</a> areas. They occur in all tropical <a
  href="/earth/Water/ocean.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">oceans</a>
  and seas of the world, and feed mainly on <a
  href="/earth/Life/plankton.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">zooplankton</a>.<p><small><em>Image courtesy of Corel Photography</em></small></p>Hydrothermal vents in the deep ocean are located at tectonic <a
  href="/earth/interior/seafloor_spreading.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">spreading
  ridges</a>. While most of the water in the deep ocean is close to freezing,
  the water at hydrothermal vents is very hot and laden with chemicals. In
  this <a
  href="/earth/extreme_environments.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">extreme
  environment</a>, certain species of <a
  href="/earth/Life/archaea.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">Archaea</a>
  and <a
  href="/earth/Life/classification_eubacteria.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">Eubacteria</a>
  thrive, enabling a unique <a
  href="/earth/Water/life_deep.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">food
  chain</a> including fish, shrimp, giant tubeworms, mussels, crabs, and clams.<p><small><em> Courtesy of NASA</em></small></p>This first global map of <a href="http://www.windows2universe.org/earth/Water/ocean.html">ocean</a> surface saltiness, released in September 2012 by the NASA Aquarius mission team, shows the distribution of salt in the first 2 cm of the Earth's ocean. <a href="http://www.windows2universe.org/earth/Water/salinity.html">Salinity</a> variations are one of the main drivers of <a href="http://www.windows2universe.org/earth/Water/circulation1.html">ocean circulation</a>, and are closely connected with the <a href="http://www.windows2universe.org/earth/Water/water_cycle.html">cycling of freshwater</a> around the planet. High salinity is seen in the Mediterranean, Atlantic, and the Arabian Sea.<p><small><em>Image courtesy of NASA/GSFC/JPL-Caltech</em></small></p>This image is a montage of high resolutions photographs of the Earth taken in January 2012 by the Visible/Infrared Imager Radiometer Suite (VIIRS) instrument on the Suomi NPP satellite.  The image shows many stunning details of <a href="http://www.windows2universe.org/earth/earth.html">our home planet</a> - <a href="http://solarsystem.nasa.gov/multimedia/gallery/VIIRS_4Jan2012.jpg">particularly at high resolution</a>. The beauty of our planet is obvious from space - our blue <a href="http://www.windows2universe.org/earth/Water/overview.html">waters</a>, our white <a href="http://www.windows2universe.org/earth/Atmosphere/cloud.html">clouds</a>, and the green from <a href="http://www.windows2universe.org/earth/Life/life.html">life</a> abundant at the surface.<p><small><em>Image courtesy of NASA</em></small></p>A new study has found that <a href="/earth/Atmosphere/airpollution_intro.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">pollution</a> from <a href="/earth/Atmosphere/particulates.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">fine particles</a> in the air - mainly the result of burning coal or <a href="/earth/interior/eruptions.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">volcanic eruptions</a> - can shade <a href="/earth/Life/cnidarian.html&dev=1/earth/Atmosphere/moons/=/earth/climate/cli_greengas.html">corals</a> from sunlight and cool the surrounding water resulting in reduced growth rates.  Coral growth rates in the Caribbean were affected by volcanic aerosol emissions in the early 20th century and by aerosol emissions caused by humans in the later 20th century.  For more information, see the <a href="http://www.exeter.ac.uk/news/featurednews/title_278202_en.html">press release</a>.<p><small><em>Image courtesy of Toby Hudson (Wikimedia Commons)</em></small></p>

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