Related by context. Frequent words. (Click for all words.) 62 interglacial period 59 Younger Dryas 59 marine sediments 56 atmospheric methane 56 glacial retreat 55 landmasses 55 microfossils 55 volcanism 55 supercontinent 55 lavas 55 Chicxulub 54 Tibetan Plateau 54 continental crust 54 retreating glaciers 54 paleoclimate 54 terrestrial ecosystems 54 interglacial 54 H. erectus 53 lake sediments 53 icecap 53 sediment cores 53 volcanic plume 53 mammal species 53 Antarctic ozone 53 glaciation 53 megafauna 53 volcanic eruptions 52 foraminifera 52 glacial melt 52 zircons 52 glacial melting 52 glaciers 51 volcanoes 51 volcanic eruption 51 hydrothermal activity 51 vertebrate species 51 Burgess Shale 51 hydrothermal vent 51 explosive eruptions 51 volcanically active 51 melting glacier 51 geologically active 51 basaltic 51 lithosphere 51 temperate forests 51 Quaternary 51 mass extinctions 51 Paleocene 50 radiocarbon 50 stalactite 50 Titan Saturn 50 volcanic 50 supernova explosion 50 coprolites 50 oceanic crust 50 Beringia 50 biodiversity hotspots 50 geologic 50 volcanic crater 50 Ordovician 50 Neandertal 49 fossilized remains 49 Radiocarbon dating 49 Medieval Warm Period 49 hydrological cycle 49 limestone cave 49 Anthropocene 49 stromatolites 49 ocean ridges 49 Eyjafjallajökull volcano 49 mountain glaciers 49 planetary nebula 49 fossils 49 eruption 49 mass extinction 49 isotopic composition 49 olivine 49 Qinghai Tibet Plateau 49 isotopic 49 Cambrian explosion 49 Eocene 49 oxygen isotopes 49 Arctic permafrost 49 Pliocene 49 landform 49 volcanic activity 49 ejecta 48 Cretaceous Period 48 microlensing 48 scarps 48 theropod 48 landforms 48 Late Cretaceous 48 Hawaiian Volcano Observatory 48 bathymetry 48 aerosol particles 48 landmass 48 Cascadia Subduction Zone 48 Indohyus 48 Tunguska 48 lava flows