CrowdScience - Why do dirt roads become rippled over time? - ÃÛÑ¿´«Ã½ Sounds

CrowdScience - Why do dirt roads become rippled over time? - ÃÛÑ¿´«Ã½ Sounds
Why do dirt roads become rippled over time?
Alice Williamson, lecturer at the University of Sydney, explains.