Explains the difference between intrusive and extrusive igneous rocks and provides pictures and descriptions of common igneous rock types in each category.

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

Click for different identification keys for igneous rocks to help you classify them correctly. Includes various color/texture keys as well as classification charts. (NOTE: At the time of writing this, the PDF links were configured...

In-depth resource for identifying rocks. Includes an interactive rock identification key to help you figure out the name of your rock.

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...

[Free Registration/Login Required] Students read about three different types of rocks: sedimentary, igneous, and metamorphic. A question sheet is available to help students build skills in classifying and categorizing.

Test your knowledge of different types of rocks by taking a quiz. Determine if each picture shows an igneous, metamorphic, or sedimentary rock.

Fourth graders identify rock types by observing key characteristics.

Classify rocks and minerals according to their characteristics.