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Watch Your Step: 6 Things You Can Fall Into: Media

Solid ground is not always so solid.

Images

Kilauea volcano
An ash cloud rising from Hawaii's Kilauea volcano in 2011.
U.S. Geological Survey
Grand Canyon
Grand Canyon National Park, Arizona, United States.
© csourav/Fotolia
La Brea Tar Pits
The La Brea Tar Pits in southern California contain remains of prehistoric animals.
Encyclopædia Britannica, Inc.
Kilauea volcano
An ash cloud rising from Hawaii's Kilauea volcano.
U.S. Geological Survey
Ninety Mile Beach: quicksand
Te Paki quicksand stream, Ninety Mile Beach, North Island, New Zealand.
© Harris Shiffman/Shutterstock.com
Antarctica: Mount Erebus
Mount Erebus, Ross Island, Antarctica.
Eli Duke