Why does the suface of Miranda and Ariel appear to have so many ridges and craters?

I am currently doin a research project on the topic of Uranus and its moons and i found that the ridges and uneven surfaces of both of thoes two moons were somethin to talk about so can someone please answer my question and your response and time wil be greatly appreciated!Why does the suface of Miranda and Ariel appear to have so many ridges and craters?
Miranda and Ariel are different in the sense that thier orbital distance from Uranus varies by as much as 1,00,00,000 kms.





Yet they dispaly similar topography and chemical composition in the atmosphere and the surface. However suggesting that Ariel might have had the same composition.





The ridges are basically the result of a neo orbital tilt and a vibrant orbital plasma. the innoxious cooling of the surfaces gases at minus 171 degrees celecius results in a wobbly surface.





Professor Johm Misqueet.Why does the suface of Miranda and Ariel appear to have so many ridges and craters?
sir can you please help me with some links that will support your reasoning... i really appreciate it

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http://en.wikipedia.org/wiki/Uranus





http://en.wikipedia.org/wiki/Miranda_%28鈥?/a>





http://en.wikipedia.org/wiki/Ariel_%28mo鈥?/a>
You see the surface of miranda is ridgy because it is believed that once a huge meteroite came and crashed into it and it broke into several pieces. but due to its gravitational force it brought itself together again. this is why it has so many ridges.





And about areial one explanation may be that at some time in the distant past Ariel might have been much warmer than it is now. If this is the case, some of the ice in the moon may have melted and smoothed out the surface of the moon and then more recent geological activity may have formed the long, wide grooves. Once again, it's a question that only extended research will provide the answer