Watch Your Step: 6 Things You Can Fall Into: Media
Solid ground is not always so solid.
Images
La Brea Tar Pits
The La Brea Tar Pits in southern California contain remains of prehistoric animals.
Encyclopædia Britannica, Inc.
Ninety Mile Beach: quicksand
Te Paki quicksand stream, Ninety Mile Beach, North Island, New Zealand.
© Harris Shiffman/Shutterstock.com