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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
A group of
  Emperor penguins wait their turn to dive into the ocean near <a
  href="/php/tour_test_sqli.php?page=/people/postcards/jean_pennycook_11_29_0.html">Ross
  Island, Antarctica</a>
  on November 3, 2004.
Emperor penguins routinely dive to 500 meters in
  search of food. Scientists are interested in understanding how they can
  endure the stress of these dives in such an <a
  href="/php/tour_test_sqli.php?page=/earth/extreme_environments.html">extreme
  environment</a>.<p><small><em> Image courtesy of Emily Stone,   National Science Foundation</em></small></p>Sinkholes are <a href="/php/tour_test_sqli.php?page=/teacher_resources/main/frameworks/esl_bi8.html">natural hazards</a> in many places around the world. They are formed when water dissolves underlying <a href="/php/tour_test_sqli.php?page=/earth/Water/carbonates.html">limestone</a>, leading to collapse of the surface.  Hydrologic conditions such as a lack of rainfall, lowered water levels, or excessive rainfall can all contribute to sinkhole development. On 2/28/2013, a sinkhole suddenly developed under the house outside of Tampa, Florida, leading to the tragic death of its occupant, Jeff Bush.<p><small><em>Image courtesy of Southwest Florida Water Management District</em></small></p>March 2012 marks the first anniversary of the 9.0 magnitude <a href="/php/tour_test_sqli.php?page=/earth/geology/quake_1.html">earthquake</a>, <a href="/php/tour_test_sqli.php?page=/earth/tsunami1.html">tsunami</a>, and resulting nuclear accident in Japan on <a href="/php/tour_test_sqli.php?page=/headline_universe/march112011earthquaketsunami.html">11 March 2011</a>.  The tsunami did massive damage, wiping out entire villages and killing ~16,000 people, and leading to one of the most serious nuclear accidents in history.  This image shows before and after photos of the area north of Sendai, where 10,000 people were lost.<p><small><em>Photos by <a href="http://www.nytimes.com/interactive/2011/03/13/world/asia/satellite-photos-japan-before-and-after-tsunami.html?hp">GeoEye/EyeQ</a>.</em></small></p>This historic image is the first ever taken from a spacecraft in orbit about <a href="/php/tour_test_sqli.php?page=/mercury/mercury.html">Mercury</a>, the innermost planet of the solar system.  Taken on 3/29/2011 by <a href="/php/tour_test_sqli.php?page=/space_missions/robotic/messenger/messenger.html">MESSENGER</a>, it shows numerous craters across the <a href="/php/tour_test_sqli.php?page=/mercury/Interior_Surface/Surface/surface_overview.html">surface</a> of the planet.  Temperatures there can reach over 800F because Mercury is so close to the Sun and rotates so slowly.  MESSENGER entered orbit around Mercury earlier in March 2011.<p><small><em>NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington</em></small></p>The spinning vortex of <a href="https://www.windows2universe.org/saturn/saturn.html">Saturn</a>'s north polar storm resembles a giant deep red rose surrounded by green foliage in this false-color <a href="http://www.nasa.gov/mission_pages/cassini/multimedia/pia14944.html">image</a> from NASA's <a href="https://www.windows2universe.org/missions/cassini.html">Cassini spacecraft</a>. The eye is 2,000 kilometers across with cloud speeds as fast as 150 meters per second.
It is not known how long this newly discovered north-polar <a href="https://www.windows2universe.org/earth/Atmosphere/hurricane/hurricane.html">hurricane</a> has been active.
The view was acquired at a distance of approximately 419,000 kilometers from Saturn.<p><small><em>NASA/JPL-Caltech/SSI</em></small></p>Scientists are concerned that melting Arctic sea ice will increase the amount of fresh water in the <a href="/php/tour_test_sqli.php?page=/earth/polar/arctic_currents.html">Beaufort Gyre</a>, which could spill out into the Atlantic and cause major climate shifts in North America and Western Europe. Watch the <a href="/php/tour_test_sqli.php?page=/earth/changing_planet/freshwater_arctic.html">Changing Planet: Fresh Water in the Arctic video</a>.<p><small><em> Courtesy of Jack Cook, WHOI (<a href="http://www.whoi.edu">Woods Hole Oceanographic Institute</a>)</em></small></p>

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF