On Tuesday, 20 October 2015 21:34:23 UTC+1, Andy Burns wrote:
David Paste wrote:

1. Am I missing something about silica - is it infact dangerous?

Not really, sand is mainly silica

Yes, this is what I thought.


2. What is silica used for in fracking?

To hold the tiny cracks in the rock open, so the gas can get out.

Thank you very much Andy!