Prelude

Well, here we are at the end of our semester. You've learned about many aspects of geology and Earth's geologic history, from trilobites to andesites, orogeny to phylogeny. Let's take one last look at some of the features you can use to interpret Earth's past.

Earth

Canyon De Chelly

Figure 16-1. Earth has a history that anyone can study and learn about.

At left, our planet as seen from Apollo 13 as it returned to Earth in April 1970.
At right, Dr. Bob leads young geoscientists on a journey through the Permian rocks of Canyon de Chelly.

What Will You Do Today?

geologic mapper / time-traveler Patrick

Review this semester's exploration through geologic history

A. Time Scale Traveling - Take one last look at the calendar of Earth's history, the geologic time scale

B. Reading Rocks and Structures - Test your memory of common rocks and structures

C. Critters of the Past - Name that fossil!

D. Geologic Finale - Finish by looking at three different Grand Canyon landscapes