Radioactive isotope dating rocks
Uranium's atomic number is 92, corresponding to its number of protons.
which decay into lead-206 and lead-207 respectively.
You also need to know when you can or cannot apply a particular type of device to the task at hand; for example, if you want to know how hot it is on the inside of an active wood stove, you probably understand that putting a household thermometer intended to measure body temperature inside the stove is not going to prove helpful.
Be aware also that for many centuries, most human "knowledge" of the age of rocks, formations such as the Grand Canyon, and everything else around you was predicated on the Genesis account of the Bible, which posits that the entire cosmos is perhaps 10,000 years old.
Perhaps you have heard of Ice Man, a man living in the Alps who died and was entombed in glacial ice until recently when the ice moved and melted.This is because when radioactive elements first come into being, they are presumed to consist entirely of a single isotope.Imagine that you enjoy a certain kind of ice cream flavored with chocolate chips." What you're actually looking for here is the temperature, which is fundamentally a description of how quickly molecules in the air are moving and colliding with one another, translated into a convenient number.You need a device to measure this activity (a thermometer, of which various kinds exist).
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To understand radiometric dating techniques, you first have to have an understanding of what is being measured, how the measurement is being made and the theoretical as well as practical limitations of the system of measurement being used.