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  • Glaciologist Nick Hulton (left) and UNIS students watch their guide drill into the sea ice in Templefjorden, Svalbard to measure its thickness.
    140305_2164.JPG
  • Kiya Riverman logs survey readings on her expedition to map an ice cave in Larsbreen, Svalbard.
    140222_0626.JPG
  • Nate Stevens takes a reading with a compass and clinometer on an expedition to map an ice cave in Larsbreen, Svalbard.
    140222_0528.JPG
  • Nate Stevens takes a reading with a compass and clinometer on an expedition to map an ice cave in Larsbreen, Svalbard.
    140222_0524.JPG
  • U. S. Geological Survey glaciologist Shad O'Neel measures the length of an exposed mass balance stake at Columbia Glacier, Alaska.
    110613_5759_pan.JPG
  • A green laser beam is projected into the sky to measure the chemical composition of the upper atmosphere at the Polish Polar Station in Hornsund, Svalbard.
    110908_5161.JPG
  • Kiya Riverman looks down a meltwater stream head cut in an ice cave in Larsbreen, Svalbard. Riverman, a glaciology graduate student, was repeat mapping the head cuts to measure their rates of erosion.
    140222_0832.JPG
  • Aerial view of invasive albizia trees (Falcataria moluccana), many dead (possibly killed deliberately as a control measure) and bleached, on Kauai, Hawaii.
    120921_2754.JPG
  • Ian Howat, a glaciologist with Ohio State University, installs an antenna for a GPS base station overlooking the Columbia Glacier, near Valdez, Alaska. The base station communicates with GPS rovers set out on the ice to measure velocities at the glacier surface.
    100518_6764.JPG
  • Ian Howat, a glaciologist with Ohio State University, installs an antenna for a GPS base station overlooking the Columbia Glacier, near Valdez, Alaska. The base station communicates with GPS rovers set out on the ice to measure velocities at the glacier surface.
    100518_6757.JPG
  • Shad O'Neel, glaciologist with the USGS, flies off in a helicopter above the Columbia Glacier, near Valdez, Alaska, to deploy GPS rovers on the glacier surface to measure surface velocities.
    100514_6204.JPG
  • A man wearing a straw hat stands facing the Pyramid of the Sun, or Pyramide del Sol, in the pre-columbian archeological site of Teotihuacan, Mexico state, Mexico, on June 23, 2008. The pyramid measures 738 ft (225 m) across and 246 ft (75 m) high, making it the third largest in the world.
    080623_5357.JPG
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