Carbon dating sedimentary rock
Every object is conceived with a certain amount of carbon 14 in them.
Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.By seeing how much C14 remains it is possible to see how long it has been since that animal died.However there are a range of other dating methods which can be used. Let me explain why: Carbon-14 only works on organisms that take in carbon-dioxide( living things ).Also anything which is too old (such as several hundred thousand years or more) can't be carbon dated because the carbon 14 will have decayed away to undetectable levels. When they die, they stop absorbing carbon 14 and the isotope then decays.Form the time of death of the organism, the quantity of C14, as a proportion of the total carbon in the organism declines and, measuring that decrease allows the age (or time of death) of the organism to be determined. Carbon 14 dating is based on the absorption of atmospheric carbon by living things.
When the thing dies it no longer takes in carbon from the atmosphere through processes such as eating or respiration and levels of C14 in the body deplete due to the natural process of radioactive decay.
To determine how old something is you see how much Carbon-14 there is in relation to Nitrogen-14.
Carbon-14 can only be used to date something that was once living and under 50,000 years. Lava itself does not contain much carbon and comes from material too old for there to be detectable levels of carbon 14.
Living organisms breathe in oxygen as well as carbon-dioxide because it's in the air, just taking in more oxygen.
But rocks doesn't TAKE IN air, oxygen, and carbon-dioxide. Carbon has several different forms- one being Carbon 14, which is mildly radioactive.
Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.