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gravel |
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gravelCoarse sediment consisting of pebbles or small fragments of rock, originating in the beds of lakes and streams or on beaches. Gravel is quarried for use in road building, railway ballast, and for an aggregate in concrete. It is obtained from quarries known as gravel pits, where it is often found mixed with sand or clay. Some gravel deposits also contain placer deposits of metal ores (chiefly tin) or free metals (such as gold and silver). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The pits filled with radioactive water, from which Navajos and their animals drank; children played near the tailings; and their parents used the sand and crushed rock to build radioactive dwellings. Some [contractors] want to crush the concrete, remove the rebar and leave the crushed rock on the jobsite--this is a good tool for that. And the price of crushed rock or aggregate jumped 50 percent over two months last summer. |
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