The document discusses the composition and classification of rocks and minerals that make up the solid part of the Earth. Rocks are made of one or more minerals. Minerals and rocks can be classified based on their origin as igneous, sedimentary, or metamorphic, or based on their properties like color, luster, hardness, and whether they are metallic or nonmetallic. Sedimentary rocks form from particles of other rocks that are eroded, transported, deposited, compacted, and cemented together over time.
