Related by context. Frequent words. (Click for all words.) 59 magma chamber 55 lava 55 mud volcanoes 54 basaltic 54 lava tubes 54 meltwater 54 lithosphere 53 volcanism 53 continental crust 53 lavas 53 basalt 53 Valles Marineris 52 crustal 52 hydrothermal vent 52 volcanic rock 52 landmasses 51 magmas 51 Arctic permafrost 51 oceanic crust 51 sandstone formations 51 molten rock 51 magmatic 51 lava flows 51 polar vortex 51 lahars 51 basalts 50 sedimentary rock 50 ejecta 50 volcanic crater 50 icecaps 50 volcanic 50 pyroclastic flow 50 ionized gas 50 poleward 50 Lake Vostok 50 magma 50 melting glacier 50 methane hydrates 49 earth crust 49 lava tube 49 volcanic vents 49 molten lava 49 atmospheric methane 49 stalactite 48 igneous rocks 48 icy crust 48 marine sediments 48 seawater 48 lunar soil 48 caldera 48 Tibetan Plateau 48 escarpments 48 steam vents 48 methane hydrate 48 hydrothermal activity 48 igneous rock 48 Weddell Sea 48 explosive eruptions 47 Earth crust 47 deep gorges 47 supercontinent 47 stromatolites 47 hydrothermal 47 glacial till 47 salt crystals 47 graben 47 geologically active 47 Oort Cloud 47 calcareous 46 glaciations 46 Saturn moon Enceladus 46 glacial lakes 46 mudstone 46 sedimentary basins 46 sediments 46 volcanic gases 46 Kilauea Volcano 46 accretion disk 46 Aquifers 46 vortices 46 Melting glaciers 46 Namib Desert 46 limestone formations 46 equatorial Pacific Ocean 46 tuffs 46 seabeds 45 landforms 45 ocean ridges 45 geologic formations 45 clasts 45 planetesimals 45 permafrost 45 solar nebula 45 glacial melt 45 olivine 45 coulees 45 spherules 45 Younger Dryas 45 calcite 45 peridotite 45 peat bogs