The Silica Slurry in Cement

The sand creates the high pressure that's necessary to force the oil out of the cracks. The lime in slag can actually, instead of just polluting the water with the phosphorus run off, it can actually be used as fertilizer. So they're taking a ton of, they're taking all the sand out of wisconsin. A the taken the their city is gone. It's good for making glass, because, again, a lot of silica am they started adding it to asphalt.