a window of something liter a antitype of something & classifying is when zero help something by mean / antitype ->  classifying is when one sorts something by class  classifying is when one sorts something by class & window is a rusts of how a stone is formed ->  rocks can be classified based on how they were formed  rocks can be classified based on how they were formed & igneous x are formed by rubber heat / region -> a rock can be classified as igneous if it was formed from magma