https://www.youtube.com/watch?v=mRqjo-N_TDU
https://www.ck12.org/c/earth-science/wegener-and-the-continental-drift-hypothesis/lesson/Wegener-and-the-Continental-Drift-Hypothesis-MS-ES/
https://www.youtube.com/watch?v=GyMLlLxbfa4
https://www.ck12.org/c/earth-science/seafloor-spreading-hypothesis/lesson/Seafloor-Spreading-Hypothesis-HS-ES/?referrer=featured_content
https://www.youtube.com/watch?v=kwfNGatxUJI