Related by context. Frequent words. (Click for all words.) 55 lithic 55 basalt rock 52 petrographic 51 nanoporous 51 lava tubes 50 carbides 50 potsherds 50 ancient petroglyphs 49 dolerite 49 lateritic 49 beehive shaped 49 palaeo 48 volcanic lava 48 yellow ocher 48 sedimentary layers 48 glasslike 48 pyroxene 48 encrusting 48 alternating layers 48 silicate minerals 48 putty colored 48 honeycomb pattern 48 belowground 48 latticed 48 stalactite 48 dolomitic 47 openwork 47 tonalite 47 surficial 47 nanoscopic 47 macroscale 47 geodes 47 erosional 47 calcite 47 surface geochemistry 47 stalactites 47 stencilling 47 tile mosaics 47 serpentinite 47 semi permeable 47 Excavated 47 rheological 46 iron sulfide 46 salt crystals 46 stalagmites 46 basalt 46 scanning tunneling microscopy 46 Undulating 46 varying thicknesses 46 lunar craters 46 igneous rocks 46 uraniferous 46 topographies 46 conical shaped 46 REE bearing 46 ziggurats 46 sunbursts 46 photolithographic 46 pyroclastic 46 clastic 45 nanomechanical 45 underwater volcanoes 45 undersea volcanoes 45 metamorphic rocks 45 geomorphology 45 volcanogenic 45 chalky white 45 terra cotta colored 45 antiferromagnetic 45 basaltic 45 tetrahedron 45 tufa 45 limestone formations 45 mosaic floors 45 pediments 45 snail shells 45 calcareous 45 concretions 45 slickrock 45 pentagonal 45 coquina 45 lotus pond 45 loess 45 diabase 45 ocher colored 45 irregular shapes 44 Staircases 44 haloes 44 fluted columns 44 Sand dunes 44 palisades 44 arcuate 44 abrasive blasting 44 stratiform 44 geometrical shapes 44 electrons behave 44 pervasively altered 44 mineralized outcrops 44 patinas 44 semicircles 44 corrugation