Related by context. Frequent words. (Click for all words.) 68 continental crust 67 Archaean 66 lithosphere 64 lavas 63 oceanic crust 62 magmas 62 marine sediments 62 graben 61 sedimentary rock 61 igneous rocks 61 depositional 61 basalts 60 zircons 60 crustal 60 clasts 60 mudstone 59 igneous rock 59 basaltic 59 calcareous 59 alluvial deposits 59 siliceous 59 supercontinent 59 Carboniferous 58 subduction 58 tuffs 58 volcanism 57 syncline 57 lake sediments 57 spinel 57 stromatolites 57 calcite 57 magmatic 57 hydrothermal breccia 57 hydrothermal activity 57 ocean ridges 57 olivine 57 Lake Vostok 56 igneous 56 haematite 56 solar nebula 56 peridotite 56 planetesimals 56 snail shells 56 Geologically 56 glaciations 56 Upper Cretaceous 56 carbonate rocks 56 schists 56 magma chamber 56 breccia zones 56 pyroxenite 55 Late Cretaceous 55 breccia pipes 55 Paleozoic 55 ultramafic rocks 55 polar vortex 55 sedimentary rocks 55 Arctic permafrost 55 volcanically active 55 intrusives 55 basalt 55 Lower Cretaceous 55 Valles Marineris 55 sediments 55 isotope ratios 55 manganese oxide 55 apatite 55 Precambrian 55 hydrothermal vent 55 sedimentary basin 55 greenstone belts 55 kimberlitic 55 hydrothermally altered 55 Quaternary 55 icy crust 55 Earth crust 55 granitic 55 porphyry mineralization 54 caldera 54 alluvium 54 silicates 54 sedimentary basins 54 osmium 54 earth crust 54 glaciation 54 sedimentary 54 quartz monzonite 54 glacial till 54 landmasses 54 Fig. 1A 54 skarn mineralization 54 massive sulphide deposits 54 iron oxides 54 weakly mineralized 54 spherules 54 calcrete 54 Paleocene 54 geologically 54 methane hydrate 54 extensional 54 carbonaceous