We do know the fossil is at least more than 300 million years old.Should we use carbon 14 to date the fossil, or uranium 238 to date the volcanic ash layer, and why? We find samples of an igneous rock demonstrate it has been through 3 half-lives. If the parent isotope starts with 100 grams, but your samples yield only 6.25 grams of the parent isotope, how many half-lives have passed? What unstable isotope would be best to refine the date of bones found in a cave hearth built by humans between 20,000 and 40,000 years ago? Argue with the following: A stone tool fashioned from a chunk of obsidian yields a date of 3,000,000 years old, therefore, the tool was made by a human 3,000,000 years ago.
The nucleus contains protons (tiny particles each with a single positive electric charge) and neutrons (particles without any electric charge).We will deal with carbon dating first and then with the other dating methods.Carbon has unique properties that are essential for life on Earth.Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.Most people today think that geologists have proven the earth and its rocks to be billions of years old by their use of the radioactive dating methods. Given so much time, the ‘impossible’ becomes possible, the possible probable, and the probable virtually certain.