Related by context. Frequent words. (Click for all words.) 57 explosive eruptions 52 lahars 52 meteoroids 50 lava flows 50 magma chamber 50 Meteorites 49 eruptions 49 quakes 48 pea sized hail 48 spherules 48 glacial lakes 48 rockfalls 48 Volcanic eruptions 48 craters 47 steam vents 47 meteoroid 47 ash plumes 47 glaciers melt 47 mass extinctions 46 ocean ridges 46 hydrothermal activity 46 meteor showers 46 caldera 46 subduction zones 46 waterspouts 46 crater 46 prolonged droughts 45 sinkholes 45 Burgess Shale 45 meteor 45 Hawaiian Volcano Observatory 45 geologically active 45 temblors 45 earthquakes 45 mountain lion sightings 45 igneous rock 45 volcanic gases 45 volcanism 45 lava tubes 45 Valles Marineris 45 Paleocene 45 plumes 45 USGS geophysicist 45 meteors 44 volcanoes 44 eruption 44 volcanic eruptions 44 Sandhill cranes 44 Kilauea volcano 44 ejecta 44 4 chars 44 ridgetops 44 billowing cloud 44 butter melts 44 Geminids 44 marine sediments 43 lavas 43 hydrothermal vent 43 retreating glaciers 43 Sunspots 43 pyroclastic flow 43 glaciers 43 Geysers 43 triggered avalanches 43 Gamma ray bursts 43 Teton Range 43 aerosol particles 43 olivine 43 cirrus clouds 43 icecaps 43 GRBs 43 glacial lake 43 Lick Observatory 43 rocky planets 43 scarps 43 dust devils 42 quakes measuring 42 Chicxulub 42 lightning strikes 42 meteorites 42 Kilauea Volcano 42 Cosmic rays 42 auroras 42 penstemon 42 Palomar Observatory 42 Halley comet 42 polar caps 42 geysers 42 Columbian mammoth 42 solar flares 42 melting snowpack 42 freeze thaw cycles 42 atmospheric methane 42 alpine lakes 42 Snowfalls 42 streambeds 42 optical telescopes 42 El Ninos 42 mid latitudes 42 ice jams 42 tectonic plates collide