Texas Rocks and Minerals

Earth''s outer crustGeologistsTime and rock unitsGeologic mapWhat are rocks and minerals?Chemical elementsMineralsRocksIgneous rocksExtrusive or volcanic igneous rocksIntrusive igneous rocksSedimentary rocksSoilsSedimentary rock materials in broken fragmentsSedimentary rock materials in solutionCementing materials and chemical sedimentsSedimentary rocks formed by plants and animalsMetamorphic rock...