Question

Why does the sunset appear to move?

Answer 1

why is phase not a good way to classify matter?

Answer 2

Alex, the earth is rotating, so — in relation to this — the the sun appears to be setting.

I don't know if this is what you are looking for, but I hope it helps. Thanks for asking.

Answer 3

First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where is more likely to be overlooked.

Since this is not my area of expertise, I searched Google under the key words "<I>classify matter phase</I>" to get these possible sources:

http://antoine.frostburg.edu/chem/senese/101/matter/
http://209.85.173.104/search?q=cache:urRbpF7Sn1gJ:doe.sd.gov/contentstandards/science/Unpacked/docs/6%2520Physical%2520Science.rtf+Classify+matter+phase&hl=en&ct=clnk&cd=2&gl=us&client=safari
http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson14.htm
http://209.85.173.104/search?q=cache:sSLOGnXUuTcJ:www.smccd.net/accounts/yarosramosh/chem192/Ch%25203%2520-%2520Matter%2520Energy.ppt+Classify+matter+phase&hl=en&ct=clnk&cd=7&gl=us&client=safari

It seems like the same matter (e.g., water) can exist in all three phases, depending on the temperature. Use your <Find> to search for "phase" within the above sites.

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.