many deposits of lead and zinc are associated with silver and are found in submarine settings that formed in association with volcanism, forming a type of deposit known as a sEDEX (sedimentary exhalative) deposit. These tend to be associated with the fringes of large volcanic flows or on the margins of subvolcanic plutons, with many examples located in the superior craton of Canada and others in Australia. Another, quite different type of lead-zinc deposit is found as metalliferous layers that replaced primary carbonate layers; the world's largest deposit of this type is found in the central united states in missouri, in the mississippi valley lead-zinc deposit belt.
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Disasters: Why No ones Really 100 Safe. This is common knowledgethat disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.