Here you will find resources to help educators and their students use models and real-time stream-flow data to understand the characteristics of high-gradient streams, identify characteristics of high-gradient streams, calculate stream slope or gradient, identify areas likely to have high-gradient streams, identify possible hazards and benefits of a high-gradient stream on a community.

Here you will find resources to help educators and their students determine the ages of the rocks of the United States, Understand the general geology of the United States, Become familiar with some of the major physiographic provinces in the United States.

Here you will find resources to help educators and their students understand the basic principles used to determine the relative ages of rock units, understand the nature and significance of unconformities and their role in deciphering geologic history, interpret the geologic history of an area using the basic principles.

Here you will find resources to help educators and their students describe the relationship between fault movement and forces that cause this motion, understand that Earth movements can create faults and folds, understand that models help scientists understand how things work.

Here you will find resources to help educators and their students understand that rocks are arranged in the Earth's crust as well-defined bodies or units, identify the general shapes of rockunits based on rock type, read and interpret geologic maps and geologic cross sections.

Here you will find resources to help educators and their students identify several igneous rocks using a rock chart, describe how the two main types of igneous rocks form, understand that igneous rocks are classified based on how they form, use a geologic map and legend to search for evidence of past igneous rock formations, understand that classification helps scientists organize the natural world into smaller workable components.

Here you will find resources to help educators and their students identify and classify several sedimentary rocks, describe how the three main types of sedimentary rocks form, understand that sedimentary rocks are divided into groups based on how they form, infer the environment in which sediment was deposited when you are given a sedimentary rock, understand that classification helps scientists organize the natural world into smaller workable components.

Here you will find resources to help educators and their students to identify and classify several metamorphic rocks using a rock chart, describe two agents of metamorphism, use a geologic map to search for evidence of past metamorphism in a community, understand that properties of materials can change over time.

Here you will find corrections to the 2001 version of the Understanding Your Environment EarthComm textbook.

Here you will find storylines for EarthComm: Understanding Your Environment: Land Use Planning and Your Community- Storylines