Re: Where do gorges come from?

robotiser@xxxxxxxxxxxxxx wrote:
I'm not sure if this is the right NG to ask this question, and this may
seem a remarkably ignorant question, but that never stopped me before.

On television, they've just shown the Blue Nile forming a waterfall in
a massive gorge. The land looks, given the aerial shot, amazingly flat
until there's a sudden "fresh looking" (sharp edges) massive gorge.
What forces could cut such a massive hole in the earth? I had a look,
and Lake Tana where the Blue Nile rises, seems well away from the great
rift valley.


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Relevant Pages

  • Where do gorges come from?
    ... seem a remarkably ignorant question, but that never stopped me before. ... until there's a sudden "fresh looking" (sharp edges) massive gorge. ... and Lake Tana where the Blue Nile rises, seems well away from the great ...
    (sci.geo.geology)
  • Re: Where do gorges come from?
    ... and Lake Tana where the Blue Nile rises, seems well away from the great ... Once the river started to cut through the basalt cap, ... The stream gradient below the waterfall ... which causes the soft rock to fall into the stream and be carried away. ...
    (sci.geo.geology)