Related by context. Frequent words. (Click for all words.) 62 troposphere 58 heliosphere 56 ionosphere 55 interstellar medium 55 atmospheric circulation 54 mid latitudes 54 sunspot activity 54 albedo 54 magnetosphere 53 spacetime 51 cosmic rays 51 cosmic radiation 51 Martian atmosphere 51 phytoplankton 51 radioactive decay 51 water vapor 50 supercooled 50 polar regions 50 vortices 50 atmospheric CO2 49 volcanism 49 neutron star 49 equatorial Pacific 49 geomagnetic field 49 upwelling 49 outer layers 49 supernova explosion 49 superfluid 49 Little Ice Age 48 atmospheric carbon dioxide 48 Earth crust 48 olivine 48 sunspots 48 silicates 48 cosmic microwave background 48 diatoms 48 nucleation 47 greenhouse warming 47 interstellar dust 47 Iapetus 47 crustal 47 regolith 47 convective 47 cosmic ray 47 Enceladus 47 solar flares 47 earth crust 47 gravitational lensing 47 gamma ray burst 46 permafrost 46 oscillations 46 sunspot 46 magma 46 gravitational 46 biosphere 46 glacial ice 46 dynamical 46 rocky planets 46 supermassive black hole 46 gravitational waves 46 nebula 46 outer planets 46 magnetic fields 46 sedimentary rock 45 ozone layer 45 galaxy clusters 45 brown dwarfs 45 terrestrial planets 45 Grimsvotn 45 Betelgeuse 45 Milky Way Galaxy 45 geomagnetic 45 quasar 45 ice crystals 45 atmospheric chemistry 45 journal Geophysical Research 45 protective ozone layer 45 dust particles 45 GRBs 45 orbiting spacecraft 45 sediments 45 volcanic eruptions 45 infrared wavelengths 45 elliptical galaxies 45 Einstein theory 45 plate tectonics 45 Saturn moons 45 aerosols 45 Sulfur dioxide 44 polar ice 44 meltwater 44 astrophysical 44 glaciation 44 conductivity 44 Antarctic Ice 44 GOCE 44 gaseous 44 calcite 44 crust 44 atmospheric 44 comet