Related by context. Frequent words. (Click for all words.) 69 volcanic activity 65 eruption 63 volcanism 62 lava flow 62 Kilauea volcano 62 eruptions 61 lava flows 61 seismicity 61 volcano 61 seismic activity 60 eruptive 59 volcanic eruptions 59 Mount Redoubt 58 volcanic gases 57 X ray emission 57 volcanologists 57 Grimsvotn 57 ash plume 56 volcanic earthquakes 56 sunspot activity 55 Eruptions 55 volcanic 55 glaciation 55 Volcanology 54 Bulusan 54 lava 54 sunspot 54 active volcanoes 54 volcanic eruption 54 geologically active 54 volcano eruption 53 magmatic 53 Solidum 53 volcanoes 53 lava dome 53 caldera 53 aurora 53 Eyjafjallajökull 52 glacial melt 52 magma 52 pyroclastic flows 52 Eta Carinae 52 rockfalls 52 dormant volcano 52 crustal 52 geomagnetic field 51 Merapi 51 active volcanos 51 Alaska Volcano Observatory 51 geomagnetic storm 51 Seismology Phivolcs 51 sunspots 51 ejecta 50 gamma ray burst 50 Phivolcs 50 NSIDC 50 El Ninos 50 Mayon volcano 50 plume 50 greenhouse warming 50 supernova explosion 49 Serreze 49 volcanologist 49 species extinctions 49 Tibetan Plateau 49 solar flares 49 mid latitudes 49 Geminids 49 Kilauea 49 atmospheric circulation 49 vulcanologist 49 geomagnetic 49 Tungurahua 49 Eruption 48 auroras 48 volcano erupts 48 temblors 48 geologic 48 ENSO 48 quakes 48 glaciers 48 crater 48 spewing ash 48 earth tremors 48 radiometric anomalies 48 volcanic crater 48 supernova explosions 48 plate tectonics 48 glacier 48 Volcanic 48 Leonids 48 lake sediments 48 observatory 48 Vulcanology 48 mudflows 47 cosmic rays 47 Redoubt 47 Katla 47 GRBs 47 USGS 47 volcano erupted