Related by context. Frequent words. (Click for all words.) 69 basalt 65 sedimentary rock 61 limestone 61 sandstone 60 volcanic rocks 59 quartzite 59 lava 58 volcanic 58 lava flows 58 chert 57 rocks 57 pumice 56 granite 56 petrified wood 56 calcite 56 olivine 55 rock formations 55 caldera 55 molten rock 55 outcrop 54 outcropping 54 schist 54 outcrops 54 magma 53 extinct volcano 53 crater 53 quarried 53 boulders 52 granites 52 magmatic 51 sediments 51 obsidian 51 rhyolite 51 limestones 51 ejecta 51 silica 51 geologically 50 sedimentary 50 stone slabs 50 andesite 50 feldspar 50 massif 50 outcroppings 50 lava flow 50 rocky outcrops 50 volcanic islands 50 talus 49 cliffs 49 rock outcroppings 49 brecciated 49 regolith 49 volcanoes 49 quartz 49 volcanic activity 49 landforms 49 rock outcropping 49 dolomite 49 carbonate 48 silicates 48 sedimentary rocks 48 gabbro 48 calcium carbonate 48 malachite 48 stalactites 48 ridge 48 ridges 48 Earth crust 48 hydrothermal 47 volcanics 47 sandstones 47 geologic 47 volcanism 47 breccia 47 lichen 47 sheer cliffs 47 stalagmites 47 mafic 46 felsic 46 sand 46 ocher 46 travertine 46 dormant volcano 46 crater rim 46 galena 46 stone slab 46 stratigraphy 46 craters 46 laterite 46 gossan 46 mica 46 Precambrian 46 breccias 46 Volcanic 46 gullies 46 canyon walls 46 boulder 45 hillside 45 crustal 45 steep slopes 45 moraine 45 earth crust