Although age indicators are called "clocks" they aren't, because all ages result from calculations that necessarily involve making assumptions about the past.Always the starting time of the "clock" has to be assumed as well as the way in which the speed of the clock has varied over time.So it repeats itself to get the numbers up, has several duplicates, and one item is even a copy of the preceding one. If you tried editing the polite version of this article and started punching the wall in frustration after a while, this is the place to say what you actually think.Yeah, it's a Gish Gallop, and a circlejerk as well: almost every reference link in the original article goes to creationist sources, usually on the same damn site. No scientific method can prove the age of the universe or the earth, and that includes the ones we have listed here.
By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.This time varies from few-millionths of a second to millions of years for different radioactive isotopes. In part, they measure the age of rocks and other natural materials by dating techniques.The exercise they will go through of working backwards from measurements to age should help them understand how scientists use carbon dating to try to determine the age of fossils and other materials.To be able to do this lesson and understand the idea of half-life, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.