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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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