This document provides information about rocks and the three main types - igneous, sedimentary, and metamorphic rocks. It explains that igneous rocks form when magma cools, sedimentary rocks form from compaction of materials, and metamorphic rocks form from intense heat and pressure altering existing rocks. Examples are given for each rock type like granite, sandstone, and slate. The rock cycle is also described as showing how rocks continuously change between the three types through various geological processes over time.