This 23-page slideshow explains what intrusive and extrusive igneous rocks are and the characteristics of their structures. Each type of structure is accompanied by one or more images. (Website for Mining Engineering students at Mehran...

What is igneous rock? How is it formed? What makes igneous rock different from sedimentary rock or metamorphic rock? This interactive OLogy card answers these and similar questions.

This resource provides a description of igneous rock, its origin and the types of rock that are formed from a volcanic eruption.

A slideshow, a karaoke song to sing along to, and a short multiple-choice quiz on the topic of igneous rocks, how they are formed, and some different types.

[Free Registration/Login Required] An interactive animation demonstrating how the mineral crystal in an igneous rock formed due to the cooling magma. Site also includes a short quiz on the formation of the crystal.

[Free Registration/Login may be required to access all resource tools.] How to classify igneous rocks.

[Free Registration/Login may be required to access all resource tools.] Determination of intrusive and extrusive igneous rocks.

[Free Registration/Login may be required to access all resource tools.] Factors that determine the composition of an igneous rock.

Students use samples of four different types of igneous rocks to observe differences in texture, color, and grain size, and then make inferences about the relative cooling histories and silica content associated with each magma type.

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

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

What are rocks made of? Where do rocks come from? What is an igneous rock? These are just some of the questions answered by the scientists of the U.S. Geologic Survey.

In this interactive tutorial you'll learn about rocks and the rock cycle. You'll be introduced to the three different rock types and what makes them what they are. You'll also learn about how the matter that makes up these rocks is...

Eight hands-on lessons module where students learn about rocks and landforms. These inquiry-based investigations explore the different types of rocks, how they are formed, the different types of landforms, and the effects of glaciers on...

Overview of rocks including igneous rocks, sedimentary rocks, metamorphic rocks, and the rock cycle.

Learn about the differences and similarities between the three different types of rocks on this page.

A well-designed lesson on rocks where students first learn about how the three categories of rocks form (sedimentary, igneous, and metamorphic), then must examine the features of different rock samples, and determine which category each...

Did you know that there are some rocks that actually float? Follow this interactive investigation to find out which ones and why.

This tutorial explains the rock cycle--from beginning to end! It is full of activities, assessments, games, slideshows and all kinds of interactive material. Learn what rocks are made of and how they change from one form to another....

Essential guide to geology of the National Parks focuses on minerals and the different types of rocks. Includes a visual glossary.

An interactive animation showing the rock cycle. By clicking on the different parts of the cycle, students can view definition of rock types and animations of the processes that happen within the cycle.

This is an in-depth activity where students create a rock layer formation using different colors of playdough and investigate the types of folds and rock formations that might occur. They take core samples through anticlines and...

Dig into the layers of activities exploring and investigating minerals and how they are related to both rocks and soil.

[Free Registration/Login may be required to access all resource tools.] Presents the three major rock types and the rock cycle.