My little guy is into all the natural disasters: tornados, hurricanes, earthquakes, and tsunamis. Tsunamis are the recent interest. We read some books and watched some videos on YouTube about tsunamis and he wanted to try one of his own.
So we emptied a large plastic bucket of toys and filled it with water. Then put in the sand for land and added a Lego guy and tree for effect.
My little Princess got to drop the balls in. She started with a little ball about an inch across. It caused a few ripples but nothing too destructive.
Then we tried a soccer ball. It made quite a few waves on the beach but couldn’t knock over the Legos.
Then we brought out the B.I.G. ball! Bye, bye Lego guy and tree. Yeah, it worked quite well… we had a full tsunami on our hands!