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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...
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Geology.com: Rocks: Rocks: Igneous, Metamorphic and Sedimentary
Rocks hold the history of the earth and the materials that will be used to build its future. This website holds a treasure of information regarding igneous, metamorphic and sedimentary rocks.
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Geology.com: Rocks: Photos of Common Intrusive and Extrusive Igneous Rock Types
Explains the difference between intrusive and extrusive igneous rocks and provides pictures and descriptions of common igneous rock types in each category.
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Geology.com: Mohorovicic Discontinuity the Moho
Explains what the Mohorovicic Discontinuity is, how it was discovered, how deep it is, and why it has not been studied much.