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7 Secret Caves We'd Love to See Inside
science.howstuffworks.com/environmental/earth/geology/secret-caves.htm
There are caves all over the world, but some are in places that are hard to explore — hidden by rocks, ruins or even under ice. We've found seven secret caves you probably never knew existed.
The Geology Behind 5 American Landmarks
science.howstuffworks.com/environmental/earth/geology/geology-american-landmarks.htm
The U.S. is full of exceptional geological formations. HowStuffWorks looks at at five that set the bar high as far as landmarks go.
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