Related by context. Frequent words. (Click for all words.) 72 volcanic eruptions 72 volcanoes 70 seismic activity 68 volcanism 66 volcano 66 volcanic 64 lava flows 64 active volcanoes 63 eruptions 63 volcanos 62 lava flow 62 eruption 61 volcanic eruption 60 magma 60 lava 59 plate tectonics 57 Merapi 56 Volcanic 55 volcano eruption 55 caldera 54 molten rock 53 tectonic 53 earth crust 53 volcanic ash 52 geologic 52 glaciers 52 Earth crust 52 quakes 51 lava dome 51 ash plume 51 sunspots 51 Phivolcs 51 Volcanology 51 earthquakes 51 volcano erupted 50 hydrothermal 50 erupting volcano 50 solar flares 50 basalt 49 atmospheric carbon dioxide 49 Enceladus 49 ash clouds 49 volcanic rock 49 cosmic rays 49 water vapor 49 volcanologist 49 equatorial 49 Seismologists 48 sunspot 48 seismologists 48 comets 47 permafrost 47 methane 47 Mount Merapi 47 Geologists 47 glacier 47 glacial ice 47 mass extinctions 47 Eyjafjallajokull 47 molten lava 47 geological 46 seismology 46 Geophysical Research 46 aurora 46 temblors 46 supernovae 46 comet 46 upwelling 46 polar regions 46 El Niño 46 Mayon volcano 46 crater 45 tectonic plate 45 Indonesian volcano 45 Surono 45 Alaska Volcano Observatory 45 extinctions 45 neutron star 45 lahar 45 geysers 45 Kilauea 45 vortices 45 westerly winds 45 El Nino 45 atmospheric CO2 45 Ellesmere Island 45 ash 44 Antarctic ice 44 convection 44 ocean currents 44 La Niña 44 Redoubt 44 plume 44 gamma ray burst 44 seismic waves 44 ash cloud 44 sediments 44 tropical cyclones 44 magnetic fields 44 rockfall 44 wind shear