Related by context. Frequent words. (Click for all words.) 70 volcanism 67 sedimentary rocks 67 olivine 67 volcanic rocks 66 silicates 66 sediments 64 basalt 64 magma 64 magmatic 64 crustal 64 sedimentary rock 63 calcite 63 lava flows 63 volcanic 62 hydrothermal 62 silicate 62 glaciation 61 intrusive rocks 61 molten rock 60 sedimentary 60 volcanics 60 Precambrian 60 plate tectonics 58 carbonate 58 volcanic rock 58 Ordovician 58 isotopic 58 subduction 58 geologically 57 earth crust 57 Eocene 57 carbonates 57 sulphides 57 caldera 57 volcanic activity 56 gabbro 56 silica 56 landforms 56 volcanoes 56 andesite 56 Proterozoic 56 abundances 56 sulfides 56 hematite 56 Earth crust 56 sandstones 56 granites 55 felsic 55 Paleozoic 55 organic molecules 55 geologic 55 regolith 55 diatoms 55 tectonics 54 lava 54 mafic 54 carbonatite 54 rocky planets 54 Pliocene 54 comets 54 subduction zones 54 chert 54 hydrothermal vents 54 feldspar 54 meltwater 54 deuterium 54 elliptical galaxies 54 neutron star 54 mid latitudes 54 Cretaceous 54 metasediments 54 water vapor 53 meteorites 53 lithologies 53 fossils 53 outcrops 53 stratigraphy 53 radiocarbon 53 radioactive decay 53 mineralogy 53 volcanic eruptions 53 Iapetus 53 Mesozoic 53 nuclei 52 iron oxide 52 rhyolite 52 ultramafic 52 superfluid 52 banded iron 52 quasars 52 oxidized 52 terrestrial planets 52 tectonic 52 pumice 52 sediment cores 52 atmospheric circulation 52 shales 52 Enceladus 52 crust 52 brecciated 52 Saturn rings