Related by context. Frequent words. (Click for all words.) 58 steam vents 57 lava tubes 54 lava 53 Kilauea volcano 53 Kilauea Volcano 52 magma chamber 52 pyroclastic flow 52 hydrothermal activity 51 lava tube 51 volcanic 51 Arctic permafrost 50 lava flows 50 temperature inversion 50 Saturn moon Enceladus 50 hydrothermal vent 49 volcanic gases 49 hot springs 49 volcanic crater 49 inversion layer 49 methane hydrate 49 molten lava 49 extinct volcano 48 lava flow 48 limestone cave 48 volcanic rock 48 marine sediments 48 snow melt 48 Sandia Mountains 47 melting glacier 47 snowfield 47 Mendenhall Glacier 47 methane hydrates 47 spewing lava 46 lava rocks 46 Superstition Mountains 46 Eyjafjallajökull volcano 46 molten rock 46 beaver pond 46 cavern 46 icy crust 46 Opportunity rover 46 volcanic activity 46 glacier 46 Tioga Pass 46 oceanic crust 46 Turnagain Arm 45 volcano 45 hydrothermal 45 evergreen forests 45 stalactite 45 geological formations 45 rock outcrop 45 Sawtooth Mountains 45 permafrost 45 glacial melting 45 canyon 45 spectacular sunsets 45 methane 44 rocky outcrops 44 hydrothermal vents 44 volcanoes 44 peridotite 44 ash spewed 44 creekbed 44 cenotes 44 rock formations 44 magma 44 magmatic 44 Lookout Pass 44 glacial till 44 spewed ash 44 Mount Redoubt 44 melting snow 44 retreating glaciers 44 lavas 44 La Nina pattern 44 ridge 44 gas hydrates 44 Burgess Shale 44 jasperoid 44 crater 44 Hanmer Springs 43 Cabeus crater 43 subarctic 43 martian soil 43 rock outcropping 43 Weddell Sea 43 sedimentary rock 43 tuffs 43 dormant volcano 43 lahars 43 peat bog 43 Hawaiian Volcano Observatory 43 outcroppings 43 rockfalls 43 volcanism 43 caldera 43 outcropping 43 Inca ruins 43 Volcanologists 43 journal Geology