Relative Dating of Geologic Materials part of Teacher Preparation:Resource Collections:Activities
This lessons allows students to constuct the basic principals used to understand relative geologic time and the skills used to construct the geologic time scale.

The Cosmic Calendar part of Cutting Edge:Rates and Time:Teaching Activities
In this activity, one takes ALL of time, from the beginning of time (i.e., the Big Bang) all the way up to today, but one compresses it into one year. One can do this for all levels of students depending on how ...

Calculating the radius of the Earth part of Integrate:Workshops:Teaching the Methods of Geoscience:Activities
Science students often have difficulty thinking about large spatial scales. The purpose of the exercise is to redo Eratosthenes' calculation of the radius of the Earth using data from to sites in ancient Egypt. The excercise teaches about the methodology of science - how Eratothenes figured it out - rather than worried about what the "right" answer is. It can also be used to discuss the role of models in geological thinking.