资料题：Which of the following is NOT mentioned according to the passage（　）。

When it gets very cold, we may have snow.The snow comes down on streets and cars.It comes down on trees and houses.ht makes everything looks pretty.But snow not only looks good.It helps people, too.It gives them water.Each bit of snow is celled a flake.Many, many flakes make up a snow fall.But one flake is never just like another.No two look the same.Each snow flake begins in a rain cloud.The min in the cloud is in little bits, called drops.Then the water gets cold.The drops tum to ice.Bits of ice stick together.They fall to the ground a snow flakes.Did you know that every snow flake has six sides? Each side is always just as long as each other side.Some flakes are small and dry.But others are big and wet.Some places are very cold.There is snow on the ground most of the time.There are no trees there.Everything is white.Even the animals are.AN the beans, foxes, and rabbits are white.Very high hills, called mountains, also get a lot of snow.In some mountains,more than six feet of snow can fall in one night.That would tum any town into Snow City!