Cave Frostwork and Popcorn
Wind Cave National Park was established in 1903. The 33,500-acre park, located in South Dakota, hosts a mixed-grass prairie ecosystem with bison, elk, and prairie dogs. Below ground is a barometric wind cave with at least 137 miles of explored passages. The cave is unusually large and was formed by boxwork. Children can visit the park’s website and view some of its great multimedia presentations at: http://www.nps.gov/wica.
Sue, the largest and best-preserved Tyrannosaurus rex fossil skeleton, was discovered by Sue Hendrickson in South Dakota in 1990. Sue is 42 feet long and probably weighed 6.4 tons when alive. After a dispute over ownership was solved, she was sold to the Field Museum of Natural History in Chicago, Illinois. Children could learn more at the Museum’s website at: 
