Nina investigates how waterfalls are made, with the help of Belle, her hearing neuron.

Originally released by BBC, 2013. Streaming video file encoded with permission for digital streaming by Infobase on November 17, 2016.

Meet the Neurons (0:56); --How Are Waterfalls Made? (2:15); -- Senses Experiment (4:21); -- Visiting a Real Waterfall (2:09); -- Waterfall Formation Experiment (2:04); -- Summary: How Are Waterfalls Made? (0:38); -- Credits: Waterfalls—Nina & the Neurons: Earth Explorers (1:32); .