<iframe width="580" height="385" src="https://www.youtube.com/embed/qalAKtLbjX8" frameborder="0" allowfullscreen></iframe> <br>This video is about how to make a volcano model which can be used in teaching and learning process. It contains a step by step ... <br><a href="https://www.youtube.com/watch?v=qalAKtLbjX8">source</a>
