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Originally posted by thegiftbearer
well... gonna go for a slam dunk and say that they aren't impacts. don't know what they are, but i can say that is what they aren't.
Originally posted by roughycannon
There are tons of craters "in a line" just in that pic, just think how many lines of craters are on the moon, the moon is 1/4 the size of our planet whats the bet that at least 1 lava tube formed along 1 of these lines of craters?
Collapse pits on Mars are formed in serveral ways. In volcanic areas, channelized lava flows can form roofs which insulate the flowing lava. These features are termed lava tubes on Earth and are common features in basaltic flows.After the lava has drained, parts of the roof of the tube will collapse under its own weight. These collapse pits will only be as deep as the bottom of the original lava tube....and so forth