While most hills and mountains on Earth originate from tectonic motions
or volcanism, Earth also has some examples of hills that originated from
impacts of large meteorites, the predominant origin for hills and
mountains on the Moon. The grey hills in this image from Devon Island
in arctic Canada are material ejected from an impact about 20 million
years ago. The site is at 75 degrees north latitude. Researchers' tents
at the left give a sense of scale.
Source: Dr. James Rice, Arizona State University
For related images, see PIA06010 and PIA06011.