Related by context. Frequent words. (Click for all words.) 52 volcanic crater 51 marine sediments 47 lava flows 47 landforms 46 volcanism 46 volcanic islands 46 retreating glaciers 46 extinct volcano 46 supernova explosion 46 volcanic eruptions 46 earthquakes 45 volcanoes 45 glaciation 44 stalagmite 44 Krakatoa 44 landmasses 44 volcanic eruption 44 eruptions 44 Tambora 44 waterspout 43 stalagmites 42 oceanic crust 42 magma chamber 42 earth tremors 42 continental crust 42 Younger Dryas 42 mass extinctions 42 tsunamis 42 dormant volcano 41 volcanic tremors 41 Volcanic eruptions 41 pyroclastic flows 41 river deltas 41 lavas 41 El Ninos 41 sedimentary rock 41 volcanic 41 lava flow 41 volcanic rock 41 Eruptions 41 plate tectonics 41 eruption 41 quakes 41 interglacial period 41 Kilauea Volcano 41 faultline 40 annular eclipse 40 ocean ridges 40 earth tremor 40 tremors 40 undersea quake 40 volcanic activity 40 molten lava 40 continental drift 40 molten rock 40 coral atolls 39 caldera 39 quakes measuring 39 lithosphere 39 seamounts 39 densely populated Java 39 active volcanos 39 earth crust 39 supernova explosions 39 tide gauges 39 Grimsvotn 39 basalt 39 epochs 39 Loma Prieta quake 39 subduction zones 39 quasars 39 glacial lakes 38 aftershocks measuring 38 crater 38 Mount Pinatubo 38 Eruption 38 tremor 38 river valleys 38 depressions 38 tectonic plates collide 38 seismograph 38 basaltic 38 dwarf galaxy 38 Richter Scale 38 eruptive 38 Haumea 38 lava tube 38 Heavy monsoon rains 38 Severe flooding 38 lava 38 tectonics 38 waterspouts 38 subduction zone 38 hydrothermal vents 37 tremor measuring 37 volcano erupted 37 magnetar 37 glaciers 37 graben 37 volcanic earthquakes 37 Cascadia subduction zone