Avalanche

For an avalanche to happen, the hill has to be 25 degrees. A clump of snow can cause a avalanche to happen. When an avalanche is happening, it goes 100-130 kilometers per hour. When a skier is crisscrossing on the hill, it can cause the snow to start falling.

Mr. Adams is a snow and avalanche scientist at Montana State University. He spends a lot of time on mountains studying avalanches and telling the speed.

I have always thought that an avalanche was a little scary because snow is cold and an avalanche is like a herd of 20,000 elephants speeding downhill.