Mars, canyon, volcano, volcanic crater. 火星, 峽谷, 火山, 火山口

Taking 16 years to create, the colourful map describes the geography of Mars as it is today while also shedding light on the red planet’s past. The map was created by the U.S. Geological Survey (USGS) in Virginia using data from four separate orbiting spacecraft

Mars map lets you tour planet's canyons, volcanoes and craters | Mail Online
Read more: http://www.dailymail.co.uk/sciencetech/article-2692702/Mars-revealed-unprecedented-Amazing-map-lets-tour-amazing-canyons-volcanoes-craters-red-planet.html#ixzz37ZLIwkdp
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Canyon - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Canyon
峽谷 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E5%B3%A1%E8%B0%B7
Volcanic crater - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Volcanic_crater
火山口 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E7%81%AB%E5%B1%B1%E5%8F%A3
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