Last week, a sinkhole estimated to be 10 feet wide and 30 feet deep appeared on the Oregon coast at Cape Kiwanda. This is the second sinkhole to appear on the cape this year. Laura Gabel is the coastal field geologist for the Oregon Department of Geology and Mineral Industries. She joins us to share what exactly sinkholes are, how they happen and what could have led to the two that appeared on the coast.