...it was shaped by flowing water and impacts.
S/B "by impacts and temporarily flowing water." Thanks MarvinStinson.
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ELECTRIC EARTH, ELECTRIC MARS
https://www.youtube.com/watch?v=5AxjrRl9hAA
‘The planet Mars, and the planet Earth, share a number of critical features that are large-scale electric features. This video is designed to explore some of them, and to explore their implications.
While Mars is a relatively small planet in comparison with the Earth, at roughly half the diameter of the Earth and one-tenth of its mass, the shared features are surprisingly large on Mars, up to ten times larger in some respects.
That’s a paradox, isn’t it? It opens up some rather interesting questions for exploration.’