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CK-12 Foundation
Ck 12: Earth Science: Sedimentary Rock Classification
[Free Registration/Login may be required to access all resource tools.] How to classify sedimentary rocks.
CK-12 Foundation
Ck 12: Earth Science: Metamorphic Rock Classification
[Free Registration/Login may be required to access all resource tools.] Examines how to classify metamorphic rocks.
CK-12 Foundation
Ck 12: Earth Science: Igneous Rock Classification
[Free Registration/Login may be required to access all resource tools.] How to classify igneous rocks.
Read Works
Read Works: Earth Rocks
[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.