However, relative dating or time can be an easy concept for students to learn.
In this activity, students begin a sequencing activity with familiar itemsletters written on cards.
Look carefully at the second set of cards with sketches of fossils on them.
Each card represents a particular rock layer with a collection of fossils that are found in that particular rock stratum.
(Means, Chelemer, and Knapp, Teaching Advanced Skills to at Risk Students: Jossey-Bass 1991) Virtually every teacher has acquired some semblance of training in this highly effective method (cooperative learning), estimates are that only about 10 percent of teachers use cooperative learning.