This educational guide explains how rocks are fundamental to our very existence on planet Earth. Contents: classification of rocks; chemical structure of minerals; classification of minerals; identification of minerals; planet earth¿s recycling program; making sedimentary rocks; clastic sedimentary rocks; nonclastic sedimentary rocks; metamorphism -- transformed rocks; making igneous rocks; classification of igneous rocks; igneous rocks in Pennsylvania; uses for rocks: oil & gas, coal, & industrial minerals; & some common & interesting minerals that can be found in Pennsylvania. Color and black & white maps & illustrations.