for more than 30 year astronomers have known that mars is lopsided. the southern highland covers about 2/3 of mars which is about 2 1/2 miles higher then the northern plains. but until now, whether disparity was causing an asteroid impact or a volcanic action on the surface of mars which has dispute. when this happened there was a huge scar on the northern half.the northern plains form an elliptical depression 6,600miles long and 4,000 miles wide and since there are crater people think that there was an widespread volcanism. the craters were formed about 4 billion years ago.
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