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February 07, 2009

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Excellent post! And I love your description of doodlebugs. I had a colleague once who would always bend over an antlion's den and yell, "Up up, doodlebug, up up!" About 1/3 of the time, the doodlebug would poke it's head out - I don't know if it was the sound vibrating the sand, or just coincidence.

We see many of those interesting antlion pits in the Carolina Sandhills. I will have to try that yell, Silver Fox and see what happens!

Interesting What is the angle of repose for mined rock?

It all depends on the character of the rock since the angle of repose is directly dependent on the friction between the fragments - large, angular fragments (which mined materials generally are) have a high natural angle of repose, often around 40 degrees. Then add water, reduce the friction, and that angle is no longer stable so natural landslides and manmade disasters like Aberfan are the result.

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