Related by context. Frequent words. (Click for all words.) 50 ocean ridges 50 hydrothermal vents 49 volcanic 48 volcanic gases 48 lavas 48 Kilauea Volcano 46 volcanic islands 46 oceanic crust 46 volcanic crater 45 marine sediments 45 lava flows 45 lithosphere 45 caldera 44 continental crust 44 hydrothermal 44 basalts 44 landforms 44 magma chamber 43 Saturn moon Enceladus 43 subduction zones 43 Tibetan Plateau 43 earth crust 43 magmatic 42 seamount 42 Volcanic eruptions 42 volcanism 42 aerosol particles 42 volcanoes 41 peridotite 41 outcrops 41 ash plumes 41 Ordovician 41 geologically active 41 X ray emission 41 volcanic activity 41 lava tube 41 hydrothermal alteration 41 volcanic rocks 41 volcanic ash clouds 40 volcanic rock 40 mudstone 40 crater 40 ejecta 40 Volcanic 40 volcanic plume 40 volcanically active 40 banded iron 40 volcanic eruption 40 high sulphidation 40 intrusive rocks 40 extinct volcano 39 volcanic eruptions 39 sediments 39 sedimentary rocks 39 crustal 39 igneous 39 billowing clouds 39 olivine 38 geologic 38 basalt 38 subduction 38 carbonate 38 volcano eruption 38 ultramafic rocks 38 tuffs 38 graphitic 38 icecap 38 calcite 38 convective 38 oceanic 38 lava 38 Earth crust 38 Kilauea volcano 38 Proterozoic 38 siliceous 38 andesite 38 granitic 38 sedimentary 38 cumulus clouds 38 eruptions 37 sedimentary rock 37 carbonaceous 37 volcano 37 meteoroids 37 plume 37 spewed ash 37 Eruptions 37 plate tectonics 37 volcano eruptions 37 magma 37 mineralizing 37 Enceladus 36 methane hydrate 36 plumes 36 structurally controlled 36 Grimsvotn 36 Geologically 36 seismicity 36 silicates 36 tectonic 36 equatorial