posted on Jan, 18 2012 @ 01:06 PM
reply to post by Hellas
"The Moon, lacks both atmosphere and tectonic activity. Therefore, the only remaining process of erosion would be from impact events. The Moon's
surface continues to be impacted by meteorite of various sizes. If the impacting body is relatively small, it will be vaporized on impact and throw
some amount of lunar surface material away from the Moon. If the impact energy is relatively low, this cloud of dust, rock and vapor will be drawn
back to the Moon's surface, making changes to the shape of the surface by cratering and by depositing drifts of rocky material called lunar ejecta.
However, if the impact energy is great enough to throw the ejected surface material off with high enough speed, it may escape the Moon's gravity and
continue off into space. Also, fine particles of ejected material may be acted on by the constant blast of subatomic particles from the Sun, known as
solar wind. If the added push from the solar wind is able to speed these fine dust particles enough, they may also escape the gravitational attraction
of the Moon and travel away into space. Evidence of ejected particle erosion has been confirmed by discovery of rocky meteorites found in Antactica
which have been chemically identified as having come from the surface of Mars.
It should be noted that it is likely that the Moon receives more dust and rocky material from space than is blown away from it by impacts and solar
wind. However, these impacts do actually erode the shape of the Moon's surface by cratering existing features."
So there is erosion and over time who is to say that something similar to the structure in South America could not have occurred. Sorry to ruin the