Don't you hate these as the answer depends on your frame of reference.
I would say that they are looking for slowly as a small crystal takes minutes to a small number of hours to diffuse into the volume of a test tube. If the volume was much larger (a swimming pool)then it might take days. However, both of which are fast on the geological time scale.
Fill up the blanks.
When a crystal of potassium permaganate is gentle placed in water itdiffues-------(fast/slowly).
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