Volcanic rocks can be dated using the potassium-40 clock, a dating method based on the decay of the potassium-40 isotope into the daughter isotope argon-40. the age of volcanic rock can be measured by comparing the amount of these two isotopes present in the rock. below is a table of data on the half-life of potassium-40. use this information to create a decay curve for both isotopes.

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Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.