How many different polymorf of snow are formed in nature?
108981
It is traditionally said that there are an infinite number of polymorphs for snow flakes.  They are all radially symmetrical and hexagonal though.
833095
an updraft of cold air freezes water droplets into crystle. All of them are 6 sided, and EVERY ONE of them is different - amazing eh.\n\nyou can go to http://snowflakebentley.com/snowflakes.htm for cool pics and \nhttp://www.kidzworld.com/site/p1587.htm\nto see how snow is formed.
81776
Snow is crystalized water and ice is frozen water.
239288
they are forms of water or precipitation
211516
# Snow: Falling ice composed of crystals in complex hexagonal forms. Snow forms mainly when water vapor turns directly to ice without going through the liquid stage, a process called sublimation.\n# Snowflakes: Aggregations of snow crystals.\n# Snow flurries: Light showers of snow that do not cover large areas and do not fall steadily for long periods of time.\nHail: Falling ice in roughly round shapes at least 0.20 inch in diameter. Hail comes from thunderstorms and is larger than sleet. Hailstones form when upward moving air -- updrafts -- in a thunderstorm keep pieces of graupel from falling. Drops of supercooled water hit and freeze to the graupel, causing it to grow. When the balls of ice become too heavy for the updrafts to continue supporting them, they fall as hailstones. Sleet, in contrast, consists of raindrops that freeze on the way down.
913268
Snow, i am sorry but i have no idea! i have some suggestions for helpful websites, though\n\ntry mathforum.org/dr.math/\n\nsorry i could not be more help ful!!! good luck
78877
The "white" is caused because snow has a great many tiny interfaces, called "phase boundaries," where air (a gas phase) meets ice (a solid phase). Every time light encounters a phase transition, it is defracted. If you've ever looked at a stick submerged partially, you've seen this--a straight stick will look like it has a bend in it right at the water's surface. Well, with snow, the tiny ice crystals, and the many small bubbles in ice (water is a bent and polar molecule, so when it freezes, it expands, making small bubbles inside), and the places where individual ice crystals begin and end--all of this scatters light all around. This makes it so that a big bunch of snow will look white. If you look at a single snowflake under a microscope, though, you will see that the crystals individally are clear.\n\nWhen it melts, there is only one phase transition, right at the surface. The light is defracted a bit, but only once--it doesn't scatter light all around like snow does.\n\nBut it can! If you've ever seen a big fountain, where the water is splashing and tumbling about, it will also look white due to phase transition. Likewise, if you make a whole bunch of tiny bubbles under water, you can scatter light and make it look white.
1143085
Pink snow is caused by blooms of a microscopic algae called Chlamydomonas nivalis.  There are several varieties of snow algae, which reinforces my belief that algae will live just about darn near anywhere.
223462
It seems to be snow fall.
171991
Thats a difficult question. It all depends on air pressure, wind, temperature, humidity, distance of the clouds above the earth. Velocity of the snowflake. Mass of the snowflake. It's really dependent on the situation and the composition of each individual snowflake. No two conditions are the same.
2208
Sleet is formed by snow (single ice crystals) being formed in cold clouds and then falling through warmer air so that they begin to partially melt, falling as wet snow - sleet.\n\nHailstones form by water droplets freezing very quickly in a cloud so that they form a small blob or nucleus rather than the larger crystal formed by a slow freezing snow flake crystal. The nucleus continues to fall through the cloud until it meets a strong upcurrent of warmer damper air coming up from the ground.  This blows the ice droplet up into the colder part of the cloud.  the warm air surrounding the nucleus cools and the water in it condenses out and freezes onto the surface of the existing ice droplet making it larger and heavier.  This is cycle isrepeated until the updraught is not strong enough to keep the hailstone airborne and it (and the millions of others with it) drop to the ground.\n\nThe stronger the updraught the larger the final hailstone.\n\nIf you collect some hailstones after they have dropped and use a sharp knife to cleanly cut one in half, you might be able to see the individuals layers of ice within the hailstone through a magnifying glass or microscope.\n\nHailstones can become very very big - have alook at the guiness book of records - but I believe that you Americans hold the record for a hailstone that fell in Kansas, USA, and was measured at 43.18cm (17 in) long - unfortunately no idea of the weight.
13029
Although snow is made of ice, their coefficients aren't exactly the same because snow is a crystalized form of ice; therefore, snow has a rougher surface. I found a number for a ski board (waxed wood) on snow, which is .14. Plastic is similar to waxed wood, in a sense. I hope this number is more accurate, and good luck on your physics project.
770917
They are different because there is no reason for them to be identical.  That sounds overly simple, but that is the idea.  There is only one way to be identical, so there are billions or trillions way for them to be different, so what are the odds that two would be equal?  Very low, so low it is virtually zero.\nAs for the symmetry, the condition that makes the flakes grow is that additional molecules of water add to the existing crystal as a function of what conditions exist; and since flakes are small, the conditions are nearly identical around the flake, hence it will tend to grow symmetrically.  But what about a snow flake right besides the first one?  Shouldn't it be growing similarly to its neighbor and thus be identical? Yes, provide that the starting crystal formed at the same moment, and with the same angle (as snow flakes are flat, that means the way they will grow depend on their angle as a function of time). Again the chance two flakes will start growing at the same time, and are at the same angle is essentially non-existent.
21452
Snow is actually clear like ice in a tray. Snow is simply a smaller version of that. It only appears white because of its small particles of ice and light reflection. there is always light reflecting even at night so the snow will still appear to be white.
693847
I think that hard frost is known as hoarfrost. Hoar frost is formed when the dew point is warmer than surface but colder than the air temperature, and colder than freezing point.
13870
Snow is made of small crystals of ice that have a different refractive index due to the air between them. When light passes across an interface between\ntwo media with different refractive indices, some of it reflect off the interface, and some is transmitted at an angle.  Every transit causes a\nscattering of the light, so that eventually light falling the sample is returned in every direction. When all the light is reflected naturally it will be white. \nIce on the other hand lets the light through making it colorless - it is a single crystal!
84123
It's not fake snow.  It depends on the temperature, amount of sunlight hitting the snow, etc.  At high altitudes like where the Olympics are the temperatures are lower, causing a dry, hard snow more like ice.  The grooming machines pack it down for competition and it becomes a hard, compacted surface, similar to a sheet of ice.  After about 10-15 racers ski over the same line and the sun hits the snow, it turns to ice.