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Geology.com: Rocks: Pictures of Sedimentary Rocks
Presents photographs of examples of clastic, chemical, and organic sedimentary rocks, with short descriptions underneath each rock image. Each rock name is also linked to its own dedicated page with a great deal of additional information...
CK-12 Foundation
Ck 12: Earth Science: Sedimentary Rock Classification
[Free Registration/Login may be required to access all resource tools.] Explains that sedimentary rocks are classified by how they formed and by grain size.