Steno developed a set of Laws (Steno's Laws) to help explain his method of inferring the ages of geological structures.
These laws are a set of hypotheses that the scientific community accepts as a starting basis without absolute proof.
Radioactive dating requires the use of a decay curve.
Introduction: Scientists use radioactive dating to determine the time in years ago that an event happened.
If you place 100 pennies in a cup, shake them up, and pour the pennies out of the cup, how many do you predict will come up heads?
What are the chances of each penny coming up heads?
After the activity students can visit the Virtual Dating web site which allows them to use the mouse to obtain values from the decay curve in answering questions about the amount of radioactive element remaining in a substance.
In order for students to understand what a decay curve is and how to use it, the following activity is helpful.Standard 3240-05 Students will investigate changes in Earth's crust and climate. The process of obtaining radioactive dates from samples is also shown.Objective 3240-0501 Model Changes in the earth's surface. Observations: What are the two sides of a penny called?In Assignment 3, we began exploring the age of the Earth. Through presentation and discussion of individual ideas, the class reached agreements as to the best way to complete each of the prompts.You worked in small groups and as a class to complete the "If Scientists Think. Today's assignment will allow you to compare and contrast your ideas to some of the actual methods scientists used to develop an estimation of the age of the Earth.Answer key available to classroom instructors with verifiable email addresses.