Related by context. Frequent words. (Click for all words.) 71 sandstone 69 volcanic rock 67 sedimentary rock 67 quartzite 67 limestone 65 gneiss 64 limestones 64 calcite 63 sedimentary 62 schist 62 volcanic rocks 61 olivine 61 andesite 61 volcanic 60 peridotite 60 granite 60 rhyolite 60 granites 60 granitic 59 chert 59 dolomite 59 volcanics 58 sediments 58 silica 58 feldspar 58 volcanism 58 carbonate 58 breccias 57 sedimentary rocks 57 quarried 57 magmatic 56 lava 56 outcrops 56 crustal 56 caldera 56 pumice 56 outcrop 55 sandstones 55 brecciated 55 molten rock 55 rock formations 55 jasper 55 hydrothermal 55 calcium carbonate 55 travertine 55 gabbro 54 diorite 54 silicates 54 lava flows 54 hematite 54 geologic 54 felsic 54 mafic 54 magma 53 gravels 53 petrified wood 53 obsidian 53 ultramafic 53 stratigraphy 53 stratigraphic 53 Earth crust 53 breccia 53 laterite 53 geologically 53 coarse grained 53 ejecta 53 lithologies 52 Precambrian 52 iron oxide 52 metasediments 52 silty 52 silicified 52 landforms 52 quartz 52 regolith 52 alkali 51 sulphides 51 intrusives 51 silicate 51 gypsum 51 earth crust 51 sediment 51 gossan 51 subduction 51 karst 51 silicification 51 sulfide mineralization 51 galena 51 massif 50 mica 50 marble 50 mineralizing 50 zircon 50 geological 50 intrusive rocks 50 disseminated sulphides 50 talus 50 garnets 50 footwall 50 barite 50 rocks