MATTER                             

In science, matter is commonly defined as the substances of which     physical objects are composed, not counting the contribution of           various energy or force-fields, which are not usually considered to be    matter per se (though they may contribute to the mass of objects).      Matter makes up much of the observable universe, although again,       light is not ordinarily considered matter. Unfortunately, for scientific     purposes, "matter" is somewhat loosely defined. It is normally defined as anything that has mass and takes up space.Matter can be in five     different states: solids, gas, liquid, plasma, and the Bose-                  Einstei condensate.                                                                       

The reason you need to learn about matter is every thing is made of    matter. The seat you are sitting on is made of matter, the food you     eat even  the air you breath. To understaind these things you first       need to understaind matter. We have been studying the phaces of      matter and that matter makes up everything.                                  

"wikipedia." matter. 27 Mar 2008  <http://en.wikipedia.org/wiki/Matter>.