What is snow well it is s and now combined. But actually is snow for some people who live around south America it be a cold thing. What makes it cold you may ask, it is a bit of frozen water that goes into the air. these things are tiny ice pieces that form into snow flakes.
Now why snowflakes are always different well probably because the ice crystal formation always changes to a little different than another. It is very shiny for a small thing. Most times there could be 10000 snowflakes in a 1ft area! Also when you say look at snow
https://www.noaa.gov/stories/how-do-snowflakes-form-science-behind-snow
Here is a link to a snowflake behind the science.
Why can snow be good rather than be the freezer of Earth.
I hate and love snow. I like it because you can build snow forts and have snowball fights. The one thing I hate and will always hate the coldness. It could get to -45 celsius and that quite cold.