There are two different changes that happens to matter. These changes are physical change and chemical change. There are also things that effect the changes like heat. Also the law of conservation of mass can tell about matter.
A physical change is one way that matter can change. When the appearence, shape, and state changes the object it is a physical change. A physical change can be reversible. For example when water freezes it turns to ice, and when it is melted ice turns back to water. A physical change is also when the object is still the same material. An example is water freezing so by stating this ice is still water. When you break a bone it is still a bone, but it is only broken.
A chemical change is the second of the two ways matter can change. A chemical change is irreversible. An example of this is when a cake is made. The cake batter turns into cake meaning you can not turn the cake back into cake batter. The cake is also not cake batter this can also make it a chemical change.
The law of conservation of mass can relate to both chemical change and physical change. It relates to chemical changes by cooking something. Say that you bake a pie the mass is the same before and after it bakes.
So changes in matter really do exist. I would think that there are ways that matter can be formed also.
I think that creating the OHpedia was very enjoyable. The one thing I liked the most was creating my lesson, and the lesson's test. The topic was also very interesting. The entire OHpedia was very succesful, and I think that it turned out great.