Snow falls from clouds that are 0 degrees or lower
in temperature. It can also become rain after it falls because the air
get hotter lower in the sky. The form of a snow flake depends on what
temperature the air is. At 0 degrees the flakes are hexagons, at -3
degrees they are needles, -6 degrees a column, -10 degrees a star whose
edges are not cut out, -12 degrees a star whose edges ARE cut out, -16
degrees a star whose edges have not been cut out, again, and at -22
degrees a column (I really hope I'm never that cold!). The photos at
the top show stars whose edges are cut out.
Snow starts in the clouds. When the air is cold
enough, snow flakes form and fall. When they become warmer as they fall,
they start getting stickier and they stick together, which makes bigger
snow flakes. When they fall to the ground we make snowmen, and have
snow ball fights.
