Related by context. Frequent words. (Click for all words.) 48 sunspot activity 47 glaciation 47 volcanic eruptions 47 volcanism 46 polar regions 46 volcanic activity 46 greenhouse warming 46 landforms 45 Little Ice Age 45 Tibetan Plateau 45 mass extinctions 44 glacial melt 43 polar caps 43 landmasses 43 eruptions 43 El Ninos 43 equatorial regions 43 volcanic eruption 42 phenomena 42 tropics 42 climatological 42 ringed planet 41 volcanoes 41 Medieval Warm Period 41 lava flows 41 mid latitudes 41 eruption 41 supernova explosion 41 decadal 41 plate tectonics 41 temperate regions 41 X ray emission 41 seismicity 41 El Nino phenomenon 41 mass extinction 41 Serreze 41 Antarctica 40 Qinghai Tibet Plateau 40 lunar eclipses 40 geomagnetic storm 40 cataclysms 40 northern latitudes 40 atmospheric circulation 40 NSIDC 40 geologically active 40 perturbations 40 melting permafrost 39 ENSO 39 active volcanos 39 vernal equinox 39 sunspots 39 megafauna 39 Northern Hemisphere 39 El Nino 39 tectonics 39 anthropogenic climate 39 meteor showers 39 extinctions 38 heatwaves 38 Eta Carinae 38 autumnal equinox 38 mountain glaciers 38 occultation 38 El Niño 38 Perseids 38 seismic activity 38 northern hemisphere 38 volcano eruption 38 subduction zones 38 Antartica 38 volcanic islands 38 lake sediments 38 moon Titan 37 equator 37 active volcanoes 37 Kilauea volcano 37 La Niña 37 greenhouse gas concentrations 37 gamma ray burst 37 aridity 37 glaciers 37 spring equinox 37 auroras 37 warmer winters 37 polar ice 37 equatorial 37 biomes 37 glacier 37 atmospheric chemistry 37 aurora 37 lava flow 37 equatorial Pacific 36 albedo 36 GRBs 36 latitudes 36 planet 36 southern hemisphere 36 solar flares 36 Iapetus 36 sunspot 36 Patzert