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Hard. The Colorado Plateau is covered with chert, a glassy rock that is really really good for making tools, making very sharp edges. You find there are pieces of chert all over the place and you can still cut your skin open very quickly with it and its been sitting out in the open. Where does chert come from . Its a marine rock thats mostly silica. You find it in these layers, sandstone layers. If you are especially in a marine or water environment, you will find this layer of chert. Its in all colors, purple, green, red, blue. Its a beautiful rock. One thing i wanted to ask you, the review i...

The experiment would have seen Canterbury, Kent's only city, carved apart, as council chiefs threatened to penalise motorists for driving from one zone to another.

Britain's towns and cities are being transformed by council eco-zealots obsessed with driving motorists off the road with Canterbury's controversial 'driving zones' the latest example of the trend.

Council bosses are proposing splitting Canterbury into five zones with residents and tourists facing fines for driving through boundaries as part of radical proposals to cut congestion