NASA - National Aeronautics and Space Administration

Glacier Grey in front of the Cuernos del Paine mountains in Chile. Image Credit: NASA

      a large body of slow moving ice

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Sentences:
Glaciers can be so long that NASA astronauts in orbit can take pictures of them.

Glaciers look like rivers made of ice.

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More Information:
http://www.nasa.gov/worldbook/wbkids/k_glacier.html
http://www.nasa.gov/worldbook/wbkids/k_iceberg.html