Related by context. Frequent words. (Click for all words.) 68 marine sediments 67 sedimentary rock 65 lavas 64 sediments 63 lithosphere 62 Earth crust 61 lake sediments 61 geologic 60 fossils 60 Late Cretaceous 60 oceanic crust 60 sedimentary rocks 59 basalts 59 crustal 58 glaciation 58 oxygen isotopes 58 Precambrian 58 landforms 57 landmasses 57 permafrost 57 plate tectonics 57 calcite 57 magmatic 57 earth crust 57 sediment cores 57 sedimentary 56 middens 56 volcanism 56 volcanic rock 56 geologic formations 56 rock formations 56 abundances 56 geologically 56 tectonics 56 basalt 55 geological formations 55 Carboniferous 55 rock outcrops 55 igneous 55 olivine 55 isotopic 55 calcareous 55 volcanic rocks 55 ejecta 54 Quaternary 54 Pliocene 54 subduction 54 carbonate rocks 54 sedimentary basins 54 tectonic 54 stalagmite 54 volcanic 54 Cretaceous 54 striations 54 Pleistocene 54 subduction zones 54 scarps 53 volcanoes 53 stalagmites 53 geological 53 Mesozoic 53 sediment 53 peridotite 53 continental drift 53 Ordovician 53 Sediments 53 limestones 53 interglacial 53 Eocene 52 diatoms 52 glaciers 52 geomorphology 52 methane hydrate 52 sandstone 52 radiocarbon 52 trilobites 52 silicates 52 landform 52 soils 52 retreating glaciers 52 terrestrial ecosystems 52 caldera 52 stratigraphy 52 Paleozoic 52 subduction zone 52 mudstone 52 geology 52 abiotic 52 megafauna 52 anomalously 51 icecap 51 talus 51 lakebed 51 fossil 51 tuffs 51 seamounts 51 carbonaceous 51 volcanic crater 51 Cretaceous Period 51 magma 51 rock outcrop