With scientist still unsure how the moon was formed, and with the relatively recent discovery of subterranean water sources and the possibility of ice collecting in craters close to the ‘poles’ ..... it’s wisest the idea of water erosion not be discounted .... as current theories are hardly ‘set in stone’ at the moment, with new research always upsetting ‘set thinking and scientific lore’.
Although I agree there is practically no evidence on the moon that suggests it once may have had an atmosphere ..... never say never ...... as extensive volcanic activity may have covered up evidence of water erosion in the past and may have left a few very isolated examples exposed.
This activity could also have created ‘pressure’ on subterranean water reservoirs. Personally, I think the main feature highlighted in the video seems pretty unusual for the lunar surface, and therefore unlikely to have been caused by atmospheric factors.
Sorry to irritate you, but I don’t buy your theory that this is a Volcanic feature.
Evidence of volcanic activity on the moon is well-known and well-recognised .... and this is clearly different. Even to geographers/geologists of modest academic ability this is a canyon formed by some sort of two stage ‘erosion’ .... not volcanic action.
However, If you can furnish convincing examples (that are clearly volcanic) of similar features on other planets or moons that mirror closely this lunar feature in character, I will buy your theory.
If anyone has a similar example of this type of feature on the lunar surface, with this ‘inner’ very meandering secondary ‘cut’ within it ..... please post it on here. It would be nice to know this is not a unique ‘canyon’ formation action going on. And if this IS a lunar ‘volcanic’ feature ..... then, with the extent of volcanic activity on the moon, we should see similar examples.
And this is the point, studying pictures of volcanic eruptions and lava flow do show cut channels but these are ‘filled with lava deposit’ and none is visible here and this secondary cut with it’s ‘meandering’ feature doesn’t look to be lava-related to be honest .....Any neutral want to comment?
Below is an example of a water cut canyon on a planet with an atmosphere (Earth) with side stream channels running in and cliff edge erosion. The moon erosion feature doesn’t have these side features because there is no current atmospheric activity on the moon.
But there could be one in the future if some cataclysmic event happens!
Never say never!
https://goo.gl/images/VweqRV
Note the meandering main channel .... very similar to the lunar feature ....
Here are examples of volcanic lava formation I dug out to compare:
https://www.google.co.uk/search?cli.....mobile-gws-wiz-img.......30i10.XtKTCWbJHME=
Nothing here vaguely mirrors the feature highlighted on the moon. (The Grand Canyon being cut mostly by water erosion).
But if you can dig out pics to prove your point, I would be interested.
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The crater highlighted at the end of the video with the flow erosion from it’s broken lip, seems to require a different explanation again from the main feature.
Try this theory .... maybe the lunar poles, like earth’s poles have shifted over time, possibly after significant impacts of various types - planetary/large meteoritic - and plate tectonic drift
Maybe this area was once ‘polar’ and had significant deposits of surface ice and subterranean water just below the surface.
Maybe this was once an ancient ice-filled impact crater located at the lunar poles, as lunar orientation changed, ice melt burst the lip .... and the slight water erosion feature was formed before evapouration.
Other erosion features in this area highlighted in the video could have been by a similar limited period of ice melt/evapouration/porous absorption.
The main feature could have been created by an impact at the head of the ‘spermatazoa’ which fractured a substantial pressurised subterranean water ‘spring’ that welled up and eroded the canyon over a long period as it evapourated and was reabsorbed.
The secondary channel being formed much later when the ‘pressure plug’ burst again at the same point .... to slightly erode a new more meandering lesser channel cut.
This makes more sense than the volcanic option. Guess we need more evidence and opinions on this.
.....Or settle we conclude differently.
