Related by context. Frequent words. (Click for all words.) 72 tectonic plates 58 tectonic plate 53 subduction zone 49 subduction zones 49 earth crust 47 Earth crust 44 volcanos 43 active volcanoes 43 seismic activity 42 seismically active 42 tectonic 41 faultline 40 volcanoes 40 volcanic activity 40 subduction 38 atomic nuclei 38 molten rock 38 magma 37 crustal 37 earthquakes 37 lava flows 36 plate tectonics 36 seamounts 36 San Andreas Fault 35 quakes 35 earth tremors 35 sedimentary rock 35 deformation 34 megacities 34 magmatic 34 hydrothermal alteration 34 caldera 34 seismic waves 33 seafloor 33 tectonics 33 temblors 33 gigatons 33 Hayward Fault 33 calcite 33 densely populated 33 lava dome 33 rockslides 33 landslides 33 volcanic rock 32 mud slides 32 coal seams 32 ridges 32 subatomic particles 32 twain 32 volcanism 32 subatomic 32 limestones 32 Eruptions 32 Tsunamis 32 crust 32 subtropics 32 basalt 32 ductile 32 tectonic shifts 32 tsunamis 32 volcano erupts 32 easily transmissible 32 volcanic 31 intersect 31 discontinuous 31 hydrothermal 31 glacial ice 31 volcanic eruptions 31 asteroid belt 31 spacetime 31 volcanic earthquakes 31 pyroclastic flows 31 hydrogen atoms 31 melting permafrost 31 gas hydrates 31 andesite 31 magnetosphere 31 rock formations 31 undersea earthquake 31 Seismologists 31 mid latitudes 31 deforming 30 rocky planets 30 Tibetan Plateau 30 olivine 30 mudflows 30 galaxy clusters 30 shear zones 30 neutrons 30 asteroids 30 Tsunami warnings 30 increasingly interdependent 30 volcanologists 30 mudslides 30 Earthquakes 30 volcano erupted 29 equatorial 29 hydrothermal vents 29 Iapetus 29 intrusive rocks 29 floods droughts