Dating of fossils and rocks
These are the parent isotope that did not change during the first half life.The teacher should have each team report how many pieces of parent isotope remain, and the first row of the decay table Figure 2 should be filled in and the average number calculated.
By comparing the proportions of parent to daughter element in a rock sample, and knowing the half-life, the age can be calculated.
Scientists use two kinds of dating techniques to work out the age of rocks and fossils. Older fossils cannot be dated by carbon methods and require radiometric.
Using relative and radiometric dating methods, geologists are able to answer the question: how old is this fossil? Stratigraphy, the study of rock layers, led to paleontology, the study of fossils.
The same procedure of shaking, counting the "survivors", and filling in the next row on the decay table should be done seven or eight more times. Each team should plot on a graph Figure 3 the number of pieces of candy remaining after each of their "shakes" and connect each successive point on the graph with a light line.
AND, on the same graph, each group should plot points where, after each "shake" the starting number is divided by exactly two and connect these points by a differently colored line.