[cogitator]

The posting of two consecutive Geology Pictures of the Week on this geological sub-topic does not constitute a long-term theme. I'm just doin' the dunes.

[cogitator]

Note on Monday afternoon; just about a minute after I posted this, the Earth Observatory site quit responding. I'll notify the ping list after it's working again. If you're just visiting and you can't see the top picture, come back tomorrow.

[geezerwheezer]

If one doesn't understand the power of nature, all they need do is look at these cool photos.