This document provides information about different types of rocks: 1. It describes igneous rocks as forming from magma and discusses their composition and texture. Examples given are granite, gabbro, basalt, and rhyolite. 2. Sedimentary rocks are described as forming from the compaction and cementation of sediments and include examples like breccia, limestone, and coal. 3. Metamorphic rocks are explained as forming from the alteration of existing rocks through heat, pressure, and stress. Examples provided are gneiss, marble, and hornfels.