Related by context. Frequent words. (Click for all words.) 47 icy crust 47 sedimentary rock 47 oceanic crust 47 salt crystals 46 magmas 46 stalactite 46 striations 46 continental crust 46 depositional 45 sandstone formations 45 igneous rock 45 lavas 45 talus 45 lava tubes 45 lunar soil 45 clasts 45 earth crust 44 mudstone 44 siltstones 44 lithosphere 44 hydrothermal vent 44 volcanic rock 44 pebbly 44 arid desert 43 glacial till 43 fissured 43 fissures 43 chalky white 43 abraded 43 igneous rocks 43 lacework 43 landforms 43 hydrothermal breccia 43 termite mounds 43 limestones 43 escarpments 43 volcanic vents 43 irregular shapes 43 hydrothermally altered 43 stalagmite 43 calcareous 42 magma chamber 42 tuffs 42 inter tidal 42 Earth crust 42 sandstone 42 stippled 42 basaltic 42 sedimentary 42 crust 42 limestone 42 carbonaceous 42 oily residue 42 Arctic permafrost 42 primordial 42 geological formations 42 syncline 42 landmasses 41 regolith 41 pelvic bones 41 landform 41 basalts 41 supercontinent 41 underground caverns 41 geologic formation 41 crevices 41 pustule 41 lakebed 41 topography 41 aquifers 41 Lake Vostok 41 cenote 41 magmatic 41 geologic formations 41 mud volcanoes 41 silty 41 surficial 41 Upper Cretaceous 41 lava tube 41 limestone formations 41 Valles Marineris 41 siltstone 41 basalt 40 rock formations 40 silt 40 protoplanetary disk 40 pus filled 40 crustal 40 abiotic 40 thick layer 40 volcanic rocks 40 argillite 40 abstract shapes 40 coal seams 40 pyritic 40 breccia pipes 40 sandy soil 40 stromatolites 40 aridity 40 reddish 40 soils