Related by context. Frequent words. (Click for all words.) 63 volcanism 63 geologically active 62 auroral 62 X ray emission 62 volcanic activity 61 Saturn moon Enceladus 60 ejecta 59 volcanically active 59 explosive eruptions 59 Enceladus 58 polar caps 58 lava flows 58 lavas 57 galaxy formation 57 spherules 57 hydrological cycle 57 Meridiani 57 magmatic 56 mid latitudes 56 substorms 56 cometary 56 glacial melting 56 volcanoes 56 dynamical 56 volcanic gases 56 methane hydrate 56 oxygen isotopes 56 aerosol particles 55 supernova explosion 55 Eta Carinae 55 sunspot activity 55 Saturn moons 55 lithosphere 55 landforms 55 Saturn rings 55 visible wavelengths 55 volcanic 55 convective 55 marine sediments 55 magnetar 55 supernova remnant 55 crustal 55 water vapor 55 greenhouse warming 55 volcanic eruptions 54 Kuiper belt 54 plate tectonics 54 seismicity 54 Saturn moon 54 basaltic 54 equatorial regions 54 solar nebula 54 Crab Nebula 54 meteoroid 54 aurora 54 Cassini imaging 54 journal Geology 54 microlensing 54 magma chamber 54 GRBs 54 silicates 54 magma 54 cosmic microwave background 54 gravitational lensing 54 meteoroids 53 extrasolar planet 53 Gliese #g 53 lunar poles 53 interstellar dust 53 glaciation 53 Earth magnetosphere 53 Brownian motion 53 geomagnetic 53 cirrus clouds 53 anisotropy 53 volcanic plume 53 Mimas 53 quark gluon plasma 53 gamma ray burst 53 extrasolar planets 53 continental crust 53 volcano erupting 53 volcanic tremors 53 Younger Dryas 52 comet nucleus 52 hydrothermal 52 geologic 52 moon Europa 52 Computer simulations 52 NASA Cassini spacecraft 52 abundances 52 astrobiologists 52 sunspot 52 polar regions 52 rocky planets 52 oscillations 52 Gamma ray bursts 52 observable universe 52 cosmic ray 52 elliptical galaxies 52 ionized gas