Of avalanches? I had no idea that different types of snowflakes adhere in different ways- and that can make all the difference. In a recent blog post from Richard Byrne Wild Weather Kitchen Experiments, he showcased the wild weather site from Open University. In these series of 4 brief videos, you can explore weather concepts and then demonstrate them in your own classroom. I think these would be great for all age levels. Her avalanche model was made of icing sugar and hot cocoa mix!