Related by context. Frequent words. (Click for all words.) 70 plate tectonics 68 volcanic activity 67 hydrothermal 65 magma 65 lava flows 64 tectonic 62 volcanic eruptions 61 volcanoes 61 volcanic 61 geologic 60 caldera 59 sedimentary 59 subduction zone 59 sediments 58 sedimentary rock 58 upwelling 58 mass extinction 58 basalt 57 glaciers 56 sedimentary rocks 56 seismic activity 56 Earth crust 56 Little Ice Age 56 atmospheric carbon dioxide 56 molten rock 56 mass extinctions 55 earth crust 55 Enceladus 54 permafrost 54 Eocene 54 Holocene 54 deformation 54 lava 54 atmospheric CO2 54 Cretaceous 53 lava flow 53 supernovae 53 meltwater 53 sunspots 53 water vapor 53 comets 53 extinctions 53 eruptions 53 quasar 53 neutron star 53 supernova 52 volcanic rocks 52 Greenland ice 52 carbonate 52 Pleistocene 52 geologically 51 convection 51 glacial ice 51 comet 51 magnetosphere 51 methane 51 glacial 51 glacier 51 polar regions 51 La Nina 51 cosmic rays 50 equatorial 50 El Niño 50 sunspot 50 tectonic plate 50 anthropogenic 50 El Nino 50 acidification 50 sediment 50 calcite 50 geological 50 La Niña 50 rocky planets 50 Geophysical Research 50 silicate 50 solar flares 50 aurora 50 carbonates 49 gamma ray burst 49 Saturn rings 49 neutrino 49 volcanic eruption 49 diatoms 49 Triassic 49 stratigraphy 49 extrasolar planets 49 galaxies 49 dynamical 49 vortices 49 gravitational waves 48 Volcanic 48 nebula 48 active volcanoes 48 quasars 48 ocean currents 48 silicification 48 eruption 48 cosmic microwave background 48 fossils 48 greenhouse gas concentrations 48 coral bleaching