Iceland's Superpowered Underground Volcanoes is a TED-Ed lesson that explains what geothermal energy, how geothermal energy plants work, and why Iceland is a leader in the use of geothermal energy. The full video and accompanying lesson questions can be seen here.
National Geographic's Volcanoes 101 explains the types of volcanoes, their shapes, common locations, and what causes volcanoes to erupt.
Applications for Education
Both of these videos are the right length and have the right style and pacing to make them an excellent candidates for a flipped lesson intended to introduce the big concepts connected to volcanoes and geothermal energy. My go-to tool for making flipped lessons continues to be EDpuzzle. You can learn how to use EDpuzzle by watching the video that is embedded below.