Which conditions are necessary for clouds to form?
o warming air and relative humidity
o cooling air and high humidity
o cooling air and surfaces for condensation
o warming air and surfaces for condensation
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1.wear safety goggles when heating or mixing substances 2.tie back long hair when doing experiment in order to prevent from catching fire or dipping into chemicals accidentally 3.keep all exits and passages clear4.wear laboratory coats

Ibelieve it is a)sort by color