Thus, as living things take in carbon, they inevitably will take up a small amount of radioactive carbon into their bodies.
When these lifeforms die, they stop taking in new carbon.
When they find one, they gather a sample of the hardened lava and send it off to a laboratory to test it for radioactive elements.
However, even if we measured how much of A and B were in a sample of rock, could we figure out how long A has been changing into B, and therefore how old the rock is? We don’t know what the rock was like when it formed, or what has happened to it since. All of these factors will affect how “old” the rock appears—in practice, usually making it appear a lot older than it really is.
To test this method, some scientists gathered samples from hardened lava at Mount St Helens, which erupted most recently in the early 1980s.
Astronomy Worksheets Biology Worksheets Coloring Worksheets Dinosaur Worksheets Geology Worksheets Geography Worksheets History Worksheets Holiday Worksheets Math Worksheets Language Arts Worksheets All Educational Worksheets Astronomy Music Biology Music Concepts Music Chemistry Music Foreign Language Music Geology Music Geography Music History Music Language Arts Music Life Skills Music Math Music Physics Music All Educational Music One method that scientists use to date ancient fossils and artifacts is called radiocarbon dating.
All living things on Earth are made up of a high percentage of an element called carbon.