Related by context. Frequent words. (Click for all words.) 63 polar regions 62 mid latitudes 61 glaciers 58 albedo 58 Greenland ice 58 greenhouse warming 58 polar ice 57 landforms 57 mountain glaciers 56 atmospheric circulation 56 volcanism 55 oceans 55 polar 55 Martian surface 55 water vapor 53 atmospheric carbon dioxide 53 silicates 53 celestial bodies 53 earths 53 sunspots 53 permafrost 52 melting glaciers 52 Antarctic ice 52 sunspot activity 52 glaciation 52 atmospheric CO2 52 melting permafrost 52 cosmic microwave background 52 Martian atmosphere 52 glacial ice 51 Iapetus 51 greenhouse gas concentrations 51 rocky planets 51 Antarctica 51 plate tectonics 51 terrestrial planets 51 Tibetan Plateau 51 HD #b [002] 50 troposphere 50 Saturn moons 50 extrasolar planet 50 glacier 50 planets 50 meltwater 50 magnetosphere 50 ozone depletion 50 Enceladus 50 Serreze 50 heliosphere 50 extrasolar planets 49 Saturn rings 49 Saturn moon 49 convective 49 atmospheric concentrations 49 atmospheric chemistry 49 interstellar dust 49 ocean currents 49 vortices 49 lava flows 48 planet 48 aerosols 48 subsurface 48 latitudes 48 ocean acidification 48 comets 48 distant galaxies 48 volcanic activity 48 comet 48 MODIS 48 melting 48 stalagmites 48 journal Geophysical Research 48 icebergs 48 dust devils 48 astrophysical 48 Arctic Ocean 48 crustal 48 volcanic eruptions 48 Earth 48 mass extinctions 47 cosmic rays 47 gas hydrates 47 martian 47 Glaciers 47 interstellar medium 47 sediment cores 47 volcanoes 47 elliptical galaxies 47 Antarctic Ice 47 equator 47 magma 47 planet orbiting 47 moon Titan 47 NASA Cassini spacecraft 47 geomagnetic field 47 cometary 47 ionosphere 46 Little Ice Age 46 biosphere 46 Antarctic Peninsula 46 anthropogenic