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Originally posted by Tuning Spork
I was just thinking. (uh-oh.) If there was an ancient civilization on Mars when there were presumed oceans and rivers, there would neccessarily have to have been a much thicker atmosphere.
Their are very few recognizable craters on Earth because the weather quickly ("quickly" in geological terms, anyway) gets rid of them.
That atmosphere and water would result in weather patterns that continuously erode and reshape the terrain.
The crater in Arizona exists because it was created relatively recently and in a desert.
it was carved in the side of a crater that was formed recently to that civilization (since it existed in their time), but shortly before Mars lost it's significant atmosphere (since it hasn't been eroded away since the carving).
the impact that created it would have been very destructive and perhaps left the surrounding area uninhabitable for a very long time.
Why is it obvious? Could you explain it?
Originally posted by FutureAbductee
It is obvious that we are not seeing cliffs that are only 20 feet high and a statue that is only 6 inches tall (absurd).
The same applies here, could you explain what makes you think that? Thanks.
You can also clearly see alot of water errosion and that the water receded over a period of many,many years.