Alice,you're very kind and useful.I'm not sure of what a teacher would say,but looking at the table you linked I'm a contralto.Which means that I *can* sing in soprano range too,but my voice is so weak and squeaky that surely I'm not a soprano,even though I can hit soprano notes,but I can't hold 'em. But,as KingBrillian said,maybe I'm a meezzo who just needs to develop her higher voice more...maybe it's just training.But,the lower note I can hit,which under normal cirumstances is a F below middle C comes out loud and powerful,but the higher note instead is so ugly and hard to sing that I guess I'm a natural contralto.Or maybe I'm an untrained mezzo ;)
KingBrilliant could be right too,the way she describes her voice as being low and loud could be said of me too,and my head voice sucks,but since I don't plan to sing opera,maybe I could work with what I got.I don't need to sing 3 octaves,or anything,I sit fine with my 2 and an (awful) bit :)

Another singing question,everybody knows that males change voice,but I guess this happens to females too,in a certain why,right? I recall my voice being much higher (a friend singing in a choir told me I was indeed a mezzo,but she said it on the spot,not after a long listening)before 17, before I learned how to sing.When I sang without breathing properly,you know,with the same voice I use for speaking pretty much...then,I don't know if it's age (I'm 23,started to have this singing voice at 17),or training or what,but it became so much lower and dark.