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Rocks make up much of Earth's crust. They tell stories of our planet's past and they also build its beauty today. Weather and other forces erode these rocks down into amazing formations. Spread the beauty by sending one of these rockin' e-cards to a friend!

Sand Castle
Sand Castle
In Uchisar, Turkey, rocks have eroded down into rippling shapes that look like a sand castle. This part of Turkey is known for its unusual rock formations.
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Flowing Fountain
Flowing Fountain
In Nevada's Black Rock Desert, the Fly Geyser spews out bursts of water like a miniature volcano.
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Amazing Arizona
Amazing Arizona
This beautiful limestone formation is located in the Blue Canyon of Arizona. Limestone is a type of sedimentary rock.
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