Track course progress. Retrieved 6 April Also unlike the hourglass, there is no way to change the rate at which radioactive atoms decay in rocks. Note that scientists give their results with a stated uncertainty. Want to learn more? V Pravdivtseva; A.
What is Relative Dating?
Create an account. In fact, beryllium-7 is not used for dating rocks, as it has a half-life of only 54 days, and heavier atoms are even less subject to these minute changes, so the dates of rocks made by electron-capture decays would only be off by at most a few hundredths of a percent. Science Basics: Yearly layers observed through 1, years; Trends observed much farther back in time Varves.