Canyon
Photo of the Grand Canyon

The Grand Canyon is one of the most studied landscapes in the world. Image Credit: NASA

      a deep, narrow valley with steep sides that may have a stream flowing through it




Sentences:
NASA Earth scientists study canyons and how they were made.

Our family went to the Grand Canyon in Arizona during summer vacation.



More Information:
http://www.nasa.gov/multimedia/imagegallery/image_feature_769.html
http://www.nasa.gov/multimedia/imagegallery/image_feature_83.html
http://www.nasa.gov/mission_pages/MRO/multimedia/pia09097.html