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Crack cocaine ârocksâ. Crack cocaine is the freebase form of cocaine that can be smoked. It may also be termed rock, work, hard, iron, cavvy, base, but is most commonly known as just crack; the Manual of Adolescent Substance Abuse Treatment calls it the most addictive form of cocaine.Crack rocks offer a short but intense high to smokers.he short-term physiological effects of cocaine include constricted blood vessels, dilated pupils, and increased temperature, heart rate, and blood pressure. Some users of cocaine report feelings of restlessness, irritability, and anxiety.
An area of rock that has numerous fractures of similar trend and dip. Rocks usually do not fail with a clean break, instead they fail through the formation of numerous fractures along a zone of failure. As a result, many named faults are actually zones of fractured rock. The term also has a regulatory use.