https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/440536![The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA's…](https://images.rawpixel.com/image_social_square/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvcGQzNi0xLXBpYTAwMTkyLmpwZw.jpg)
![The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA's…](https://images.rawpixel.com/image_social_square/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvcGQzNi0xLXBpYTAwMTkyLmpwZw.jpg)
The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA's Viking Orbiter 1. Original from NASA . Digitally enhanced by rawpixel.
The north polar residual ice cap, which is cut by spiral-patterned troughs, is located at the top in this view from NASA's Viking Orbiter 1. Original from NASA . Digitally enhanced by rawpixel.
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