Igneous, sedimentary, and metamorphic. Yes, it's the thee types of rocks. And here's a great video to introduce the young geologists in your class to the rock cycle.

Holocene, Pleistocene, Pliocene, Miocene, Oligocene, Eocene, Paleocene ... wait, did I miss one? PBS Digital Studios explains how human impact on Earth has potentially brought about a new epoch in geologic history, the Anthropocene....

This lesson will present how to identify and classify sedimentary rocks. It is 3 of 3 in the series titled "Geology: Sedimentary Rocks." [4:29]

A video that will help you understand how rocks are classified based on how they are formed. Video will explore the different rock types: igneous, sedimentary, and metamorphic. [4:22]

Explains how metamorphic rocks form from protoliths due to high pressure, temperature, or chemically active fluids. Discusses foliation, how metamorphic rocks are classified, and where the three basic types of rocks can be found. The...

This lesson will present how to identify and classify igneous rocks. It is 1 of 3 in the series titled "Geology: Igneous Rocks."

This lesson will present how to identify and classify various rocks and minerals. It is 2 of 2 in the series titled "Geology: Rock Classification Overview."

This lesson will present how to identify and classify metamorphic rocks. It is 2 of 3 in the series titled "Geology: Metamorphic Rocks."

This lesson will present how to identify and classify metamorphic rocks. It is 1 of 3 in the series titled "Geology: Metamorphic Rocks."

This lesson will present how to identify and classify geodes. It is 2 of 2 in the series titled "Geology: Geodes."

Paul Andersen explains how soils are formed and classified. Weathering of rock creates particles which are mixed with water, air, and organic material. Soils are classified according to particle size, chemical makeup, and horizon...

Did you know that Earth's 4.6 billion-year history has distinct periods? In this video, learn how geologists use evidence in rock record to classify these periods. [6:36]