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Cracks

From Biology-Online Dictionary | Biology-Online Dictionary
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Crack

a fissure or fracture. Caused by the effects of stress on weak or weakened parts of a material.

to break a large, complex compound into simpler compounds.

to open something slightly.

a narcotic drug illegal in most countries which is a cheaper, more addictive, smokeable version of cocaine (another illegal narcotic) with more adverse effects on the user than cocaine.