Question....

I have been trying to finish up my planning for the upcoming home school year but one question remains from last year and I cannot seem to answer it.    What to use for Science curriculum? 

We are mainly Charlotte Mason style but I am not against using a different style of curriculum.   I have thought about just doing Nature Study with them until they get a little older. 

Also, at what age would you generally start a specific Science curriculum?  This is where it gets confusing looking at all the different curriculums out there.  Some dont start until "grade" 3 or 4 and some start at "grade"1.  So what "grade" or age do you really start with the Science....and Geography and History for that matter? 

We started with some History last year and some Geography and some Science, but the girls quickly lost interest in all three....so we laid back and concentrated on Reading, Hadnwriting and Math...with Fun stuff thrown in.  But now I am back where I was last year....with the questions of when do I start teaching these and what do I teach. 

Any input would be much appreciated!
 Crystal