Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in. The age of formations is marked on a geologic calendar known as the geologic time scale. Development of the...

General marble information, Arkansas geology, and a history of production are discussed by the Arkansas Geological Commission.

4th grade students from the Swift River Elementary School in New Salem, Massachusetts, created this field guide to local geology, featuring "Things to Know" and "Places to Visit", as part of a study of local geology and rocks and...

Understand the basics of geologic stresses in this study guide.

This site was created by two geoscientists. They explain the Principles of Geology. These are general rules, or laws, that are used to determine how rocks were created and how they changed through time. They are also used to determine...

Resource explores the history and geology of the Cascade Mountains. Content includes a geologic story, virtual field trip, a look at plate tectonics and the rocks & minerals found in the Cascade Mountains, geologic maps, and more.

In this interactive tutorial, you will learn about the types of weathering and erosion that rocks and landforms undergo. This will lead to a discussion of soil and the types of soil. Lastly, you will learn about mass movements of soil,...

This textbook excerpt explains the concept of isostasy and the relationship of Earth's crust to the mantle beneath it. This process is compared to the effects of glaciation and describes the effect an ice sheet has on the crust, and the...

A nonfiction article where students read about Julie Codispoti, assistant curator at the United States Polar Rock Repository, located at Ohio State University's Byrd Polar Research Center. The article provides an overview of Antarctic...

Extensive information about the geology of the Grand Canyon. Looks at some principles of geology evident there, forces that have shaped its geological features, how its valleys and canyons were formed, the characteristics of the Colorado...

If you need a technical summary of igneous rock classification, then this resource is worth checking out. It has several different diagrams to help you visualize the classification process.

A lengthy scholarly article that discusses the geologic time scale, its history of development, age-dating events that occurred in different eras, and how absolute and relative dating are used to assess the ages of the Earth and Moon....

Instructional module focusing on the rock cycle. Discussion includes the concept of uniformitarianism and how earth materials change from one form to another. The site also includes an interactive practice quiz and links relating to the...

In this amazing interactive tutorial, you'll learn about minerals - the building blocks or rocks and the Earth. We'll talk about what makes something a mineral, and how differences in these minerals let us organize them into different...

Visit an active volcano site to find out the connection between the movement of the Earth's plates and the processes deep within the Earth's interior. [58:23]

In this interactive tutorial you will explore how geologists use clues in rocks to determine the order in which rocks formed. Learn how principles of radioactivity are used to assign actual ages to rocks. Students will explore fossils...

Help students to understand the Geologic Cycle, Hydrologic Cycle, Physical Properties of Rocks and Surficial Processes with this learning module. Find lessons covering each topic.

Discover the origin of the Canadian Geologic Survey. Find out the qualifications necessary to be a geologist and how they locate fossil fuels.

This one-page explanation of the rock cycle contains a very helpful diagram and useful explanatory notes. Site explains how rocks are made and broken down.

In this investigation, students will observe, record and compare the differing landscapes and rocks located at three sites along the MN River Valley.

A collection of video lectures from a course introducing students to the basics of engineering geology. Webpage includes forty lectures from a professor at the National Programme on Technology Enhanced Learning. Lectures vary in length...

For this field activity, learners measure rock fractures with a geologic compass and formulate a hypothesis to explain the origin of the fractures.

Students observe and discuss what forces have changed Minnehaha Falls and shaped the geological features surrounding it.

Students are challenged to interpret the rock layers and formation of the Grand Canyon, to discover what geologic processes took place to form the rock layers of the Grand Canyon.