Related by context. Frequent words. (Click for all words.) 58 earth crust 58 Earth crust 56 tectonics 56 crustal 55 lithosphere 55 erupting volcanoes 55 earthquakes volcanoes 54 tectonic plate 54 oceanic crust 54 escarpments 54 tectonic 53 undersea volcanoes 53 igneous rock 53 magma chamber 53 tectonic plates 52 continental crust 52 volcanic 52 marine sediments 52 igneous rocks 52 volcanoes 51 plate tectonics 51 Tibetan Plateau 50 subduction zone 50 basalt 50 subduction zones 50 ocean ridges 50 earthquakes 50 tectonic plates collide 50 seismic waves 50 clasts 50 landforms 50 Olympus Mons 50 magmatic 50 receding glaciers 49 geologic 49 seismographic 49 pyroclastic 49 hardened lava 49 metamorphic rocks 49 magmas 49 biogeochemical 49 supervolcano 49 Liquefaction 48 rocks 48 subduction 48 precipices 48 deformation 48 pyroclastic flow 48 thawing permafrost 48 steam vents 48 melting glacier 48 volcanic rock 48 hydrothermal activity 48 deltaic 48 EarthScope 48 basaltic 47 earth tremors 47 volcanic eruptions 47 Cascadia subduction zone 47 Tidal waves 47 Cascadia Subduction Zone 47 granite cliffs 47 glacial 47 Kilauea Volcano 47 icecap 47 permafrost 47 geological 47 tectonic fault 47 seismicity 47 geomorphology 47 retreating glaciers 47 Arctic permafrost 47 Volcanic eruptions 47 limestone caves 47 icecaps 47 seismic 47 volcanic peaks 47 polar vortex 46 Alpine glaciers 46 temperature gradient 46 caldera 46 depressions 46 megathrust 46 glacial melt 46 lava tubes 46 andesitic 46 igneous 46 meteorite impacts 46 sediments 46 stalagmite 46 basalts 46 lavas 46 glacial retreat 46 Tharsis 46 deep gorges 46 landmasses 46 extensional 46 volcanic gases 46 volcanic vents 45 mud volcanoes 45 glaciers