Explania is one of my favourite platform when looking for tutorials and step by step guides. If you are a teacher then you must check out that website you will definately find materials to help you in your teaching. As a matter of example, I found out a video about Tsunami. Even though the clip is very short yet it offers a wealth of easily understandable information about how Tsunamis are created and the effects and damages they befall upon a place they hit. Check out this video to learn more.
Tsunami Infographic from Shal on Vimeo.