Related by context. Frequent words. (Click for all words.) 59 glaciation 56 Little Ice Age 56 atmospheric circulation 56 volcanism 55 mass extinctions 55 sunspot activity 54 El Ninos 54 mid latitudes 54 ocean currents 53 continental drift 53 greenhouse warming 52 plate tectonics 52 Greenland ice 52 Antarctic Peninsula 52 equatorial Pacific 52 glacial melt 52 substorms 52 crustal 52 oscillations 52 geomagnetic 51 Earth magnetosphere 51 Antarctic ice 51 Antarctica 51 equatorial 51 glacial 51 ICESat 51 Pliocene 50 landmasses 50 glaciers 50 polar 50 Greenland glaciers 50 Iapetus 50 polar regions 50 perturbations 50 Holocene 50 latitudes 50 oceanic 50 NSIDC 50 decadal 49 sunspots 49 equatorial regions 49 sediment cores 49 landforms 49 geomagnetic field 49 atmospheric CO2 49 Pleistocene 49 Arctic Ocean 49 Ordovician 49 mountain glaciers 48 climatological 48 ENSO 48 NASA Cassini spacecraft 48 Medieval Warm Period 48 extinctions 48 polar caps 48 X ray emission 48 perturbation 48 tectonic 48 meltwater 48 albedo 48 Antarctic 48 Greenland Ice 48 Quaternary 47 oscillation 47 glacial ice 47 icecap 47 Tibetan Plateau 47 tropics 47 Late Cretaceous 47 astronomical observations 47 epochs 47 dynamical 47 radiative 47 outer planets 47 geomagnetic storms 47 GOCE 47 permafrost 47 geologic 47 atmospheric carbon dioxide 47 North Atlantic Oscillation 47 upwelling 47 sunspot 46 melting permafrost 46 Northern Hemisphere 46 volcanic eruptions 46 Antarctic Ice 46 volcanic activity 46 polar ice 46 Antarctic peninsula 46 Wilkins Ice Shelf 46 supernova explosion 46 spacetime 46 baleen whales 46 martian 46 sedimentary basins 46 tectonics 46 ejecta 46 Serreze 46 geomagnetic storm 46 temperature gradient 45 Eocene