The ripple effect. Forance/Shutterstock. When I was playing “splash rocks”, I noticed that when I threw the rock into the river it made a circle shape, which got bigger. How does it make the ripple?

Snow! It's sometimes icy and crunchy, wet and sticky, or puffy and light. It can dust the ground or cover it in HUGE piles! People sled on it, ski on it, snowboard... you get the idea. It falls from ...

But Why – A show for curious kids is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, ...