An index fossil. An index fossil's age is known, allowing
scientists to know the relative age of other fossils based on their
position relative to the index fossil. (Ex. If a fossil is deeper
in the earth, it is older than the index fossil)
An index fossil. An index fossil's age is known, allowing
scientists to know the relative age of other fossils based on their
position relative to the index fossil. (Ex. If a fossil is deeper
in the earth, it is older than the index fossil)
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The relative refractive index tells the speed of light in a
vaccum over the speed of light in medium.