Concerning the formation of scientific knowledge to school children there's a general rule, as mentioned by Bogdan and Stanculescu (1970), which consist in "enriching, precising and continuous correcting of notions" (Bogdan and Stanculescu, 1970, p.161),
In the primary education from our country, the concepts of natural sciences which belong to the Life sciences, Earth sciences and physical sciences, begin to from at the school children during the preparatory class, 1st grade and 2nd grade within the integrated didactical activities realized at the discipline Mathematics and environment exploration, according to the curriculum elaborated in 2013.