Related by context. Frequent words. (Click for all words.) 63 volcanism 62 volcanic eruptions 61 supernova explosion 60 plate tectonics 60 supernova explosions 59 ejecta 58 mass extinctions 57 volcanic activity 57 silicates 56 magnetosphere 56 cosmic rays 56 radioactive decay 56 solar flares 56 comets 56 greenhouse warming 55 Saturn rings 55 olivine 54 meteorites 54 volcanoes 54 landforms 54 terrestrial planets 54 crustal 54 glaciation 54 X ray emission 54 asteroids 53 coronal mass ejections 53 cosmic radiation 53 vortices 53 subduction zones 53 polar caps 52 cometary 52 lava flows 52 regolith 52 volcanic gases 52 craters 52 eruptions 52 Iapetus 52 hydrothermal 52 atmospheric chemistry 52 tectonic 52 volcanic 52 tectonics 52 earth crust 52 Earth crust 52 magmatic 51 magnetic fields 51 organic molecules 51 silicate 51 mid latitudes 51 chemical reactions 51 molten rock 51 oscillations 51 interstellar medium 51 outer planets 51 rocky planets 51 supernovae 51 atmospheric carbon dioxide 51 glacial melt 51 atmospheric circulation 50 melting permafrost 50 cosmic ray 50 diatoms 50 equatorial regions 50 mass extinction 50 neutron star 50 cosmic microwave background 50 landmasses 50 geomagnetic storm 50 asteroid 50 convective 50 comet 50 sedimentary rock 50 anthropogenic 50 ocean currents 50 geomagnetic field 50 planets 50 moon Europa 50 perturbations 49 convection 49 geologic 49 iron oxides 49 neutron stars 49 Meteorites 49 interstellar dust 49 geologically active 49 galaxy clusters 49 polar regions 49 sunspot activity 49 spacetime 49 astrophysical 49 sunspots 49 calcite 49 radiative 49 Enceladus 48 water vapor 48 dwarf galaxies 48 micrometeorites 48 atomic nuclei 48 quasars 48 gravitational lensing 48 crust