Related by context. Frequent words. (Click for all words.) 70 plate tectonics 57 volcanism 57 glaciation 57 glaciers 54 extinctions 54 Antarctic ice 52 tectonic 52 Earth crust 51 Greenland ice 51 Antarctica 50 geologic 50 volcanoes 49 glacier 49 tectonic plate 49 Pleistocene 49 Antarctic Ice 48 speciation 48 mass extinction 48 volcanic activity 48 atmospheric circulation 48 magma 47 ocean currents 47 Antarctic Peninsula 47 earth crust 47 upwelling 47 Little Ice Age 47 Ice Age 47 mountain glaciers 47 glacial ice 47 greenhouse warming 47 polar ice 47 tectonic plates 46 mass extinctions 46 Homo sapiens 46 subduction zone 46 melting glaciers 46 glacial 46 Greenland 46 mammoths 46 tropics 45 woolly mammoths 45 volcanic eruptions 45 Gondwana 45 climatological 44 caldera 44 deformation 44 prehistory 44 geology 44 dinosaurs 44 volcanic 44 atmospheric CO2 44 quantum theory 43 equator 43 atmospheric carbon dioxide 43 Neanderthals 43 epochs 43 oceans 43 landforms 43 Tibetan Plateau 43 icebergs 43 quantum mechanics 43 fossils 42 melting ice 42 permafrost 42 oceanic 42 sedimentary rock 42 Precambrian 42 evolutionary biologists 42 Ellesmere Island 42 migratory patterns 42 evolution 42 Arctic Ocean 42 lava flows 42 hydrothermal vents 42 Glaciers 42 phenomena 42 astrophysical 42 geological 41 evolutionary 41 isotopic 41 global warming 41 San Andreas Fault 41 ENSO 41 meltwater 41 warming 41 anthropogenic 41 neutron stars 41 atmospheric chemistry 41 cosmology 41 equatorial 41 quantum physics 41 acidification 41 biosphere 41 wormholes 41 paleo 41 sediments 40 evolutionary theory 40 polar 40 Iapetus 40 melting 40 Enceladus